Upgrade from dotenv-rails to dotenv 3.2

dotenv-rails is no longer required, the Rails autoloading is included in basic dotenv now

Gemfile

@@ -11,7 +11,7 @@ gem 'mysql2', '~> 0.5.5'
 
 # For reading the .env file, which you can use in development to more easily
 # set environment variables for secret data.
-gem 'dotenv-rails', '~> 2.8', '>= 2.8.1'
+gem 'dotenv', '~> 3.2'
 
 # For the asset pipeline: templates, CSS, JS, etc.
 gem 'sprockets', '~> 4.2'

Gemfile.lock

@@ -143,10 +143,7 @@ GEM
     devise-encryptable (0.2.0)
       devise (>= 2.1.0)
     diff-lcs (1.6.2)
-    dotenv (2.8.1)
-    dotenv-rails (2.8.1)
-      dotenv (= 2.8.1)
-      railties (>= 3.2)
+    dotenv (3.2.0)
     drb (2.2.3)
     e2mmap (0.1.0)
     email_validator (2.2.4)
@@ -493,7 +490,7 @@ DEPENDENCIES
   debug (~> 1.9.2)
   devise (~> 4.9, >= 4.9.2)
   devise-encryptable (~> 0.2.0)
-  dotenv-rails (~> 2.8, >= 2.8.1)
+  dotenv (~> 3.2)
   falcon (~> 0.48.0)
   haml (~> 6.1, >= 6.1.1)
   http_accept_language (~> 2.1, >= 2.1.1)