Fix rubocop style violations

.rubocop.yml

@@ -13,3 +13,7 @@ Style/TrailingCommaInLiteral:
 
 Metrics/AbcSize:
     Max: 18
+
+Metrics/BlockLength:
+    Exclude:
+        - 'spec/**/*.rb'

Gemfile

@@ -7,8 +7,8 @@ def ruby_version?(constraint)
 end
 
 group :test do
-  gem 'json', '< 2.0' if ruby_version?('< 2.0')
   gem 'coveralls'
+  gem 'json', '< 2.0' if ruby_version?('< 2.0')
   gem 'rack', '< 2.0' if ruby_version?('< 2.2.2')
   gem 'rack-test'
   gem 'rake'

lib/prometheus/client/push.rb

@@ -45,11 +45,11 @@ def delete
       def parse(url)
         uri = URI.parse(url)
 
-        if uri.scheme == 'http'
-          uri
-        else
+        if uri.scheme != 'http'
           raise ArgumentError, 'only HTTP gateway URLs are supported currently.'
         end
+
+        uri
       rescue URI::InvalidURIError => e
         raise ArgumentError, "#{url} is not a valid URL: #{e}"
       end

lib/prometheus/client/registry.rb

@@ -24,9 +24,8 @@ def register(metric)
         @mutex.synchronize do
           if exist?(name.to_sym)
             raise AlreadyRegisteredError, "#{name} has already been registered"
-          else
-            @metrics[name.to_sym] = metric
           end
+          @metrics[name.to_sym] = metric
         end
 
         metric