Bump git from 1.7.0 to 1.13.1

Bumps [git](https://github.com/ruby-git/ruby-git) from 1.7.0 to 1.13.1.
- [Release notes](https://github.com/ruby-git/ruby-git/releases)
- [Changelog](https://github.com/ruby-git/ruby-git/blob/master/CHANGELOG.md)
- [Commits](ruby-git/ruby-git@v1.7.0...v1.13.1)

---
updated-dependencies:
- dependency-name: git
  dependency-type: indirect
...

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

Gemfile.lock

@@ -6,8 +6,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     ansi (1.5.0)
     asciidoctor (1.5.6.1)
     ast (2.4.1)
@@ -59,7 +59,8 @@ GEM
     font-awesome-sass (4.7.0)
       sass (>= 3.2)
     formatador (0.2.5)
-    git (1.7.0)
+    git (1.13.1)
+      addressable (~> 2.8)
       rchardet (~> 1.8)
     guard (2.16.2)
       formatador (>= 0.2.4)