Bump gem versions

Gemfile

@@ -1,12 +1,8 @@
 source 'https://rubygems.org'
 
-# For Ruby 2.2, because :ruby_22 is not a recognize platform with older Bundler versions
-gem 'curses'  if RUBY_VERSION >= '2.1'
-
-# For Ruby 2.1, and so that it is avoided for Ruby 2.0
-gem 'curses', :platforms => [:ruby_21]
+gem 'curses', '~> 1.2.4'
 
 group :test do
-  gem 'rake'
-  gem 'rspec'
+  gem 'rake', '~> 12.3.0'
+  gem 'rspec', '~> 3.7.0'
 end

Gemfile.lock

@@ -1,27 +1,30 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    curses (1.0.1)
-    diff-lcs (1.2.5)
-    rake (10.4.2)
-    rspec (3.2.0)
-      rspec-core (~> 3.2.0)
-      rspec-expectations (~> 3.2.0)
-      rspec-mocks (~> 3.2.0)
-    rspec-core (3.2.3)
-      rspec-support (~> 3.2.0)
-    rspec-expectations (3.2.1)
+    curses (1.2.4)
+    diff-lcs (1.3)
+    rake (12.3.0)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.2.0)
-    rspec-mocks (3.2.1)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.2.0)
-    rspec-support (3.2.2)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  curses
-  rake
-  rspec
+  curses (~> 1.2.4)
+  rake (~> 12.3.0)
+  rspec (~> 3.7.0)
+
+BUNDLED WITH
+   1.16.1