Bump dotenv-rails from 2.5.0 to 2.6.0

Bumps [dotenv-rails](https://github.com/bkeepers/dotenv) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/master/Changelog.md)
- [Commits](https://github.com/bkeepers/dotenv/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -65,7 +65,7 @@ GEM
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
     coderay (1.1.2)
-    concurrent-ruby (1.1.3)
+    concurrent-ruby (1.1.4)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.4)
@@ -78,15 +78,15 @@ GEM
     diff-lcs (1.3)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
-    dotenv (2.5.0)
-    dotenv-rails (2.5.0)
-      dotenv (= 2.5.0)
+    dotenv (2.6.0)
+    dotenv-rails (2.6.0)
+      dotenv (= 2.6.0)
       railties (>= 3.2, < 6.0)
     dragonfly (1.2.0)
       addressable (~> 2.3)
       multi_json (~> 1.0)
       rack (>= 1.3)
-    erubi (1.7.1)
+    erubi (1.8.0)
     execjs (2.7.0)
     faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
@@ -106,7 +106,7 @@ GEM
       domain_name (~> 0.5)
     http-form_data (2.1.1)
     http_parser.rb (0.6.0)
-    i18n (1.1.1)
+    i18n (1.5.1)
       concurrent-ruby (~> 1.0)
     io-like (0.3.0)
     jwt (1.5.6)
@@ -122,14 +122,14 @@ GEM
     method_source (0.9.2)
     mimemagic (0.3.2)
     mini_mime (1.0.1)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nio4r (2.3.1)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.0)
+      mini_portile2 (~> 2.4.0)
     oauth2 (1.4.0)
       faraday (>= 0.8, < 0.13)
       jwt (~> 1.0)
@@ -180,7 +180,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
-    rake (12.3.1)
+    rake (12.3.2)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)