Bump rugged from 1.5.1 to 1.7.1

Bumps [rugged](https://github.com/libgit2/rugged) from 1.5.1 to 1.7.1.
- [Release notes](https://github.com/libgit2/rugged/releases)
- [Changelog](https://github.com/libgit2/rugged/blob/master/CHANGELOG.md)
- [Commits](libgit2/rugged@v1.5.1...v1.7.1)

---
updated-dependencies:
- dependency-name: rugged
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -14,7 +14,7 @@ gem 'nokogiri', '~> 1.14.3'
 gem 'parser', '~> 3.1.3'
 gem 'rgl', '~> 0.5.9'
 gem 'rubyzip', '~> 2.3.2'
-gem 'rugged', '~> 1.5.1'
+gem 'rugged', '~> 1.7.1'
 gem 'safe_yaml', '~> 1.0'
 gem 'thor', '~> 1.1.0'
 gem 'toml', '~> 0.3.0'

Gemfile.lock

@@ -159,7 +159,7 @@ GEM
     ruby-progressbar (1.10.1)
     ruby2_keywords (0.0.4)
     rubyzip (2.3.2)
-    rugged (1.5.1)
+    rugged (1.7.1)
     safe_yaml (1.0.5)
     simplecov (0.21.2)
       docile (~> 1.1)
@@ -213,7 +213,7 @@ DEPENDENCIES
   rspec_junit_formatter
   rubocop (~> 0.93)
   rubyzip (~> 2.3.2)
-  rugged (~> 1.5.1)
+  rugged (~> 1.7.1)
   safe_yaml (~> 1.0)
   simplecov (~> 0.21.2)
   thor (~> 1.1.0)