lib: update gem version to 1.3.3 (#31)

* lib: update gem version to 1.3.3

* docs: remove historical warnings from readme

README.md

@@ -1,4 +1,4 @@
-# The Keccak (SHA3) digest for Ruby
+# The Keccak (SHA3 candidate) digest for Ruby
 
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@@ -8,9 +8,7 @@
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-This Ruby extension exposes the [Keccak](http://keccak.noekeon.org/) (SHA3) digest `C` bindings in the non-final version used by [Ethereum](https://ethereum.org). It is based on the reference `C` implementation, version 3.2. The exposed interface is almost identical to that of the `digest` standard library. See [#16](https://github.com/q9f/keccak.rb/pull/16).
-
-:warning: **Note: version `~> 1.3` exposes `digest/keccak` (`Digest::Keccak`) whereas version `~> 1.2` maintains the old `digest/sha3` (`Digest::SHA3`) for backward compatibility.** Only use `~> 1.2` if you want to lazy-patch your library. It works, but it's _not recommended._ Use `~> 1.3` and simply rename SHA3 to Keccak.
+This Ruby extension exposes the [Keccak](http://keccak.noekeon.org/) (SHA3 candidate) digest `C` bindings in the non-final version used by [Ethereum](https://ethereum.org). It is based on the reference `C` implementation, version 3.2. The exposed interface is almost identical to that of the `digest` standard library. See [#16](https://github.com/q9f/keccak.rb/pull/16).
 
 ## Installation
 
@@ -25,8 +23,6 @@ gem install keccak
 gem 'keccak', '~> 1.3'
 ```
 
-**Note**: as of version `~> v1.1`, `digest-sha3` (historic name, see below) requires Ruby 2.2. The new `keccak` version `~> v1.2` now also supports Ruby 3.0. The last version that worked on older Ruby (1.x) versions was `~> v1.0`. It can be found at the no longer maintained `digest-sha3` [repository from 2015](https://github.com/phusion/digest-sha3-ruby/releases/tag/release-1.0.2).
-
 ## Usage
 
 This gem extends the `digest/*` module by a `digest/keccak` class.
@@ -69,8 +65,6 @@ A part of the test suite is automatically generated from Keccak's reference test
 
 ## Warning: Keccak vs. SHA3
 
-**Note:** This gem still uses the `Digest::SHA3` namespace in version `~> 1.2` for reasons of backward compatibility and long-term maintainability. See history section below.
-
 :warning: This gem does **not** implement the final FIPS202 standard, today known as SHA3 but rather an early version, commonly referred to as Keccak. The reason why this is kept around, is that Ethereum uses this earler version of Keccak. See also: [Ethereum: Difference between keccak256 and sha3](https://ethereum.stackexchange.com/questions/30369/difference-between-keccak256-and-sha3).
 
 If you are looking for the final SHA3 gem, please use the following: https://rubygems.org/gems/sha3

lib/digest/keccak/version.rb

@@ -2,6 +2,6 @@
 
 module Digest
   class Keccak
-    VERSION = "1.3.2"
+    VERSION = "1.3.3"
   end
 end