Upgrade rspec

Signed-off-by: Arnau Siches <[email protected]>

Author: arnau

.editorconfig

@@ -1,11 +1,11 @@
 root = true
 
-[Makefile]
-indent_style = tab
-
 [*]
 indent_style = space
 indent_size = 2
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab

Makefile

@@ -31,3 +31,6 @@ doc: mri-doc
 repl: mri-repl
 shell: mri-shell
 check: mri-check
+
+local-install:
+	bundle install --path bundle/vendors

iso8601.gemspec

@@ -61,7 +61,7 @@ Gem::Specification.new do |s|
 
   s.has_rdoc = 'yard'
   s.required_ruby_version = '>= 2.0.0'
-  s.add_development_dependency 'rspec', '~> 3.4'
+  s.add_development_dependency 'rspec', '~> 3.6'
   s.add_development_dependency 'rubocop', '~> 0.50'
   s.add_development_dependency 'pry', '~> 0.11.0'
   s.add_development_dependency 'pry-doc', '~> 0.11.0'