Merge pull request #4 from hacktoolkit/dependabot/bundler/ffi-1.15.0

Bump ffi from 1.9.18 to 1.15.0

Author: jontsai

Gemfile.lock

@@ -21,7 +21,7 @@ GEM
     execjs (2.7.0)
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.18)
+    ffi (1.15.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
     github-pages (172)