Bump rubocop from 0.43.0 to 0.48.1

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.43.0 to 0.48.1.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.43.0...v0.48.1)

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

Gemfile.lock

@@ -37,7 +37,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.3.8)
     arel (6.0.4)
-    ast (2.3.0)
+    ast (2.4.0)
     bcrypt (3.1.12)
     builder (3.2.3)
     capistrano (2.15.6)
@@ -197,11 +197,11 @@ GEM
       nenv (~> 0.1)
       shellany (~> 0.0)
     orm_adapter (0.5.0)
-    parser (2.3.1.4)
-      ast (~> 2.2)
+    parser (2.7.0.2)
+      ast (~> 2.4.0)
     pg (0.18.2)
     power_assert (0.2.4)
-    powerpack (0.1.1)
+    powerpack (0.1.2)
     protected_attributes (1.0.9)
       activemodel (>= 4.0.1, < 5.0)
     pry (0.10.1)
@@ -241,7 +241,8 @@ GEM
       activesupport (= 4.2.11)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rainbow (2.1.0)
+    rainbow (2.2.2)
+      rake
     rake (10.5.0)
     rb-fsevent (0.9.5)
     rb-inotify (0.9.5)
@@ -286,13 +287,13 @@ GEM
       rspec-mocks (~> 3.1.0)
       rspec-support (~> 3.1.0)
     rspec-support (3.1.2)
-    rubocop (0.43.0)
-      parser (>= 2.3.1.1, < 3.0)
+    rubocop (0.48.1)
+      parser (>= 2.3.3.1, < 3.0)
       powerpack (~> 0.1)
       rainbow (>= 1.99.1, < 3.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.8.1)
+    ruby-progressbar (1.10.1)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
     sass (3.2.19)
@@ -362,7 +363,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.1)
-    unicode-display_width (1.1.1)
+    unicode-display_width (1.6.1)
     warden (1.2.7)
       rack (>= 1.0)
     webrat (0.7.3)