message: stylable.io: fix security vulnerability by updating 'ffi' ruby package
diff: @@ -4,8 +4,8 @@ GEM
  addressable (2.5.2)
  public_suffix (>= 2.0.2, < 4.0)
  colorator (1.1.0)
  - ffi (1.9.18)
  - ffi (1.9.18-x64-mingw32)
  + ffi (1.9.25)
  + ffi (1.9.25-x64-mingw32)
  forwardable-extended (2.6.0)
  jekyll (3.5.2)
  addressable (~> 2.4)
  