cleanup quite a bit, move to go module structure

.gitignore

@@ -1,2 +1,18 @@
-_output
+*.log
+~*
+*.tmp
+tmp
+*.txt
+dist
+*.test
+*.prof
+*.conf
+*.yml
+*.yaml
+!.goreleaser.yml
+!.travis.yml
+!example.*.yml
+!example.*.yaml
+vendor/*
+vault-exporter
 vault_exporter

.goreleaser.yml

@@ -1,16 +1,16 @@
-builds:
-  - main: main.go
-    binary: vault_exporter
-    goos:
-      - darwin
-      - linux
-    goarch:
-      - amd64
-      - 386
+# goreleaser.yml
+project_name: vault-exporter
+build:
+  binary: vault-exporter
+  goos:
+    - linux
+  goarch:
+    - amd64
+  ldflags: -s -w -X main.version=v{{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}
 archive:
   format: tar.gz
   files:
     - README.md
     - LICENSE
-
-dist: _output
+snapshot:
+  name_template: snapshot-{{.Commit}}