Fixes bundle warnings (#44)

Author: davidwessman

Gemfile.lock

@@ -2,8 +2,8 @@ PATH
   remote: .
   specs:
     w_syntax_tree-erb (0.9.4)
-      prettier_print (>= 1.2.0)
-      syntax_tree (>= 6.1.1)
+      prettier_print (~> 1.2, >= 1.2.0)
+      syntax_tree (~> 6.1, >= 6.1.1)
 
 GEM
   remote: https://rubygems.org/
@@ -28,10 +28,10 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  bundler
-  minitest
-  rake
-  simplecov
+  bundler (~> 2)
+  minitest (~> 5)
+  rake (~> 13)
+  simplecov (~> 0.22)
   w_syntax_tree-erb!
 
 BUNDLED WITH

syntax_tree-erb.gemspec

@@ -23,11 +23,11 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = %w[lib]
 
-  spec.add_dependency "prettier_print", ">= 1.2.0"
-  spec.add_dependency "syntax_tree", ">= 6.1.1"
+  spec.add_runtime_dependency "prettier_print", "~> 1.2", ">= 1.2.0"
+  spec.add_runtime_dependency "syntax_tree", "~> 6.1", ">= 6.1.1"
 
-  spec.add_development_dependency "bundler"
-  spec.add_development_dependency "minitest"
-  spec.add_development_dependency "rake"
-  spec.add_development_dependency "simplecov"
+  spec.add_development_dependency "bundler", "~> 2"
+  spec.add_development_dependency "minitest", "~> 5"
+  spec.add_development_dependency "rake", "~> 13"
+  spec.add_development_dependency "simplecov", "~> 0.22"
 end