Fix default branch name and gem metadata indentation

Author: ursm

CONTRIBUTING.md

@@ -25,7 +25,7 @@ Want to contribute to Split? That's great! Here are a couple of guidelines that
 
 ## Setup instructions
 
-You can find in-depth instructions to install in our [README](https://github.com/splitrb/split/blob/master/README.md).
+You can find in-depth instructions to install in our [README](https://github.com/splitrb/split/blob/main/README.md).
 
 *Note*: Split requires Ruby 1.9.2 or higher.
 

split.gemspec

@@ -15,13 +15,13 @@ Gem::Specification.new do |s|
   s.summary     = "Rack based split testing framework"
 
   s.metadata    = {
-   "homepage_uri" => "https://github.com/splitrb/split",
-   "changelog_uri" => "https://github.com/splitrb/split/blob/master/CHANGELOG.md",
-   "source_code_uri" => "https://github.com/splitrb/split",
-   "bug_tracker_uri" => "https://github.com/splitrb/split/issues",
-   "wiki_uri" => "https://github.com/splitrb/split/wiki",
-   "mailing_list_uri" => "https://groups.google.com/d/forum/split-ruby"
- }
+    "homepage_uri" => "https://github.com/splitrb/split",
+    "changelog_uri" => "https://github.com/splitrb/split/blob/main/CHANGELOG.md",
+    "source_code_uri" => "https://github.com/splitrb/split",
+    "bug_tracker_uri" => "https://github.com/splitrb/split/issues",
+    "wiki_uri" => "https://github.com/splitrb/split/wiki",
+    "mailing_list_uri" => "https://groups.google.com/d/forum/split-ruby"
+  }
 
   s.required_ruby_version = ">= 2.5.0"
   s.required_rubygems_version = ">= 2.0.0"