Drop support for rbx and bump gemspec

.travis.yml

@@ -6,13 +6,11 @@ script: 'ruby -vr bundler/setup -S rake test'
 
 matrix:
   include:
-    - rvm: 2.3
     - rvm: 2.4
+      env: RUBYOPT=--enable-frozen-string-literal
     - rvm: 2.5
+      env: RUBYOPT=--enable-frozen-string-literal
     - rvm: ruby-head
+      env: RUBYOPT=--enable-frozen-string-literal
     - rvm: jruby
       env: JRUBY_OPTS=--debug
-    - rvm: rbx
-
-  allow_failures:
-    - rvm: rbx

README.md

@@ -26,7 +26,7 @@ Muack is much simpler and thus much faster and much more consistent.
 
 ## REQUIREMENTS:
 
-* Tested with MRI (official CRuby), Rubinius and JRuby.
+* Tested with MRI (official CRuby) and JRuby.
 
 ## INSTALLATION:
 

muack.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib".freeze]
   s.authors = ["Lin Jen-Shin (godfat)".freeze]
-  s.date = "2017-03-13"
+  s.date = "2018-05-29"
   s.description = "Muack -- A fast, small, yet powerful mocking library.\n\nInspired by [RR][], and it's 32x times faster (750s vs 23s) than RR\nfor running [Rib][] tests.\n\n[RR]: https://github.com/rr/rr\n[Rib]: https://github.com/godfat/rib".freeze
   s.email = ["godfat (XD) godfat.org".freeze]
   s.files = [
@@ -43,22 +43,26 @@ Gem::Specification.new do |s|
   "test/test_from_readme.rb".freeze,
   "test/test_mock.rb".freeze,
   "test/test_modifier.rb".freeze,
+  "test/test_prepend.rb".freeze,
   "test/test_proxy.rb".freeze,
   "test/test_satisfying.rb".freeze,
   "test/test_spy.rb".freeze,
-  "test/test_stub.rb".freeze]
+  "test/test_stub.rb".freeze,
+  "test/test_visibility.rb".freeze]
   s.homepage = "https://github.com/godfat/muack".freeze
   s.licenses = ["Apache-2.0".freeze]
-  s.rubygems_version = "2.6.10".freeze
+  s.rubygems_version = "2.7.7".freeze
   s.summary = "Muack -- A fast, small, yet powerful mocking library.".freeze
   s.test_files = [
   "test/test_any_instance_of.rb".freeze,
   "test/test_coat.rb".freeze,
   "test/test_from_readme.rb".freeze,
   "test/test_mock.rb".freeze,
   "test/test_modifier.rb".freeze,
+  "test/test_prepend.rb".freeze,
   "test/test_proxy.rb".freeze,
   "test/test_satisfying.rb".freeze,
   "test/test_spy.rb".freeze,
-  "test/test_stub.rb".freeze]
+  "test/test_stub.rb".freeze,
+  "test/test_visibility.rb".freeze]
 end