fix: examples/Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-RACK-2848599
- https://snyk.io/vuln/SNYK-RUBY-RACK-2848600

examples/Gemfile.lock

@@ -1,107 +1,125 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    awesome_print (1.8.0)
-    backports (3.15.0)
-    diff-lcs (1.3)
-    faraday (0.15.4)
+    awesome_print (1.9.2)
+    diff-lcs (1.5.0)
+    expgen (0.1.1)
+      parslet
+    faraday (1.10.0)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
+      faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0)
+      faraday-multipart (~> 1.0)
+      faraday-net_http (~> 1.0)
+      faraday-net_http_persistent (~> 1.0)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
+      faraday-retry (~> 1.0)
+      ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
+    faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-multipart (1.0.3)
       multipart-post (>= 1.2, < 3)
-    faraday_middleware (0.13.1)
-      faraday (>= 0.7.4, < 1.0)
+    faraday-net_http (1.0.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    faraday-retry (1.0.3)
+    faraday_middleware (1.2.0)
+      faraday (~> 1.0)
     filelock (1.1.1)
     find_a_port (1.0.1)
-    json (2.3.1)
-    multi_json (1.13.1)
+    json (2.6.2)
+    multi_json (1.15.0)
     multipart-post (2.1.1)
-    mustermann (1.0.3)
-    pact (1.38.0)
-      json (> 1.8.5)
-      pact-mock_service (~> 2.10)
-      pact-support (~> 1.8)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    pact (1.62.0)
+      pact-mock_service (~> 3.0, >= 3.3.1)
+      pact-support (~> 1.16, >= 1.16.9)
       rack-test (>= 0.6.3, < 2.0.0)
-      randexp (~> 0.1.7)
-      rspec (>= 2.14)
+      rspec (~> 3.0)
       term-ansicolor (~> 1.0)
-      thor
-      webrick
-    pact-message (0.5.0)
-      pact-mock_service (~> 2.6)
+      thor (>= 0.20, < 2.0)
+      webrick (~> 1.3)
+    pact-message (0.11.1)
+      pact-mock_service (~> 3.1)
       pact-support (~> 1.8)
-      thor (~> 0.20)
-    pact-mock_service (2.12.0)
+      thor (>= 0.20, < 2.0)
+    pact-mock_service (3.10.0)
       filelock (~> 1.1)
       find_a_port (~> 1.0.1)
       json
-      pact-support (~> 1.2, >= 1.2.1)
+      pact-support (~> 1.16, >= 1.16.4)
       rack (~> 2.0)
       rspec (>= 2.14)
       term-ansicolor (~> 1.0)
-      thor (~> 0.19)
+      thor (>= 0.19, < 2.0)
       webrick (~> 1.3)
-    pact-provider-verifier (1.23.0)
-      faraday (~> 0.9, >= 0.9.0)
-      faraday_middleware (~> 0.10)
+    pact-provider-verifier (1.36.1)
+      faraday (>= 0.9.0, <= 2.0)
+      faraday_middleware (>= 0.10, <= 2.0)
       json (> 1.8)
-      pact (~> 1.36)
+      pact (~> 1.59)
       pact-message (~> 0.5)
-      rack (~> 2.0)
+      rack (~> 2.1)
       rack-reverse-proxy
-      rake (~> 10.4, >= 10.4.2)
       rspec (~> 3.5)
       rspec_junit_formatter (~> 0.3)
-    pact-support (1.10.2)
-      awesome_print (~> 1.1)
-      find_a_port (~> 1.0.1)
-      json
-      randexp (~> 0.1.7)
-      rspec (>= 2.14)
+    pact-support (1.17.0)
+      awesome_print (~> 1.9)
+      diff-lcs (~> 1.4)
+      expgen (~> 0.1)
       term-ansicolor (~> 1.0)
-      thor
-    rack (2.2.3)
-    rack-protection (2.0.5)
+    parslet (2.0.0)
+    rack (2.2.3.1)
+    rack-protection (2.2.0)
       rack
-    rack-proxy (0.6.5)
+    rack-proxy (0.7.2)
       rack
     rack-reverse-proxy (0.12.0)
       rack (>= 1.0.0)
       rack-proxy (~> 0.6, >= 0.6.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rake (10.5.0)
-    randexp (0.1.7)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.3)
+    rspec (3.11.0)
+      rspec-core (~> 3.11.0)
+      rspec-expectations (~> 3.11.0)
+      rspec-mocks (~> 3.11.0)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
-    rspec_junit_formatter (0.4.1)
+      rspec-support (~> 3.11.0)
+    rspec-support (3.11.0)
+    rspec_junit_formatter (0.5.1)
       rspec-core (>= 2, < 4, != 2.12.0)
-    sinatra (2.0.5)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.5)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.5)
-      sinatra (= 2.0.5)
-      tilt (>= 1.3, < 3)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
+      tilt (~> 2.0)
+    sync (0.5.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)
-    thor (0.20.3)
-    tilt (2.0.9)
-    tins (1.20.2)
-    webrick (1.4.2)
+    thor (1.2.1)
+    tilt (2.0.10)
+    tins (1.31.1)
+      sync
+    webrick (1.7.0)
 
 PLATFORMS
   ruby
@@ -112,4 +130,4 @@ DEPENDENCIES
   sinatra-contrib
 
 BUNDLED WITH
-   1.17.1
+   1.17.3