Update rugged requirement from >= 0.26, < 1.7 to >= 0.26, < 1.8

Updates the requirements on [rugged](https://github.com/libgit2/rugged) to permit the latest version.
- [Release notes](https://github.com/libgit2/rugged/releases)
- [Changelog](https://github.com/libgit2/rugged/blob/master/CHANGELOG.md)
- [Commits](libgit2/rugged@v1.6.3...v1.7.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -7,7 +7,7 @@ PATH
       highline (>= 1.7.8, < 2.2.0)
       launchy (>= 2.4.3, < 2.6.0)
       pusher-client (~> 0.6.2)
-      rugged (>= 0.26, < 1.7)
+      rugged (>= 0.26, < 1.8)
       terminal-notifier (~> 2.0.0)
       terminal-table (>= 1.8, < 3.1)
       thor (>= 0.20, < 1.3)
@@ -180,7 +180,7 @@ GEM
       parser (>= 3.1.1.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    rugged (1.6.3)
+    rugged (1.7.2)
     sawyer (0.9.2)
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)

circleci-cli.gemspec

@@ -10,7 +10,7 @@ def production_dependency(spec)
   spec.add_dependency 'highline', '>= 1.7.8', '< 2.2.0'
   spec.add_dependency 'launchy', '>= 2.4.3', '< 2.6.0'
   spec.add_dependency 'pusher-client', '~> 0.6.2'
-  spec.add_dependency 'rugged', '>= 0.26', '< 1.7'
+  spec.add_dependency 'rugged', '>= 0.26', '< 1.8'
   spec.add_dependency 'terminal-notifier', '~> 2.0.0'
   spec.add_dependency 'terminal-table', '>= 1.8', '< 3.1'
   spec.add_dependency 'thor', '>= 0.20', '< 1.3'