Update Gemfile

Now that we are using the generally available version of Dependabot, it
will help us with updating dependencies.

This commit removes version constraints from `Gemfile` to allow
Dependabot to generate update PRs more easily.

Gemfile

@@ -15,38 +15,38 @@ gem "bourbon"
 gem "clearance"
 gem "coffee-rails"
 gem "delayed_job_active_record"
-gem "dynamic_form", "~> 1.1.4"
+gem "dynamic_form"
 gem "flutie"
 gem "font-awesome-rails"
-gem "formtastic", "~> 4.0.0"
+gem "formtastic"
 gem "friendly_id"
-gem "gravatarify", "~> 3.1.0"
+gem "gravatarify"
 gem "high_voltage"
 gem "inline_svg"
 gem "jquery-rails"
 gem "jquery-ui-rails"
 gem "kaminari"
 gem "mime-types"
-gem "mimemagic", "~> 0.3.10"
-gem "neat", "~> 1.9.1"
-gem "nokogiri", ">= 1.6.7.2"
+gem "mimemagic"
+gem "neat"
+gem "nokogiri"
 gem "octokit"
-gem "omniauth", "~> 1.9.1"
-gem "omniauth-github", "~> 1.4.0"
+gem "omniauth"
+gem "omniauth-github"
 gem "paperclip"
 gem "pg"
 gem "pg_search"
 gem "pry-byebug"
 gem "pry-rails"
 gem "puma"
-gem "rack-rewrite", "~> 1.5.1"
+gem "rack-rewrite"
 gem "rails"
 gem "rails_admin"
 gem "recipient_interceptor"
 gem "redcarpet"
 gem "redis"
 gem "request_store"
-gem "responders", "~> 3.0"
+gem "responders"
 gem "rexml"
 gem "sassc"
 gem "scenic"
@@ -65,7 +65,7 @@ source "https://rails-assets.org" do
 end
 
 group :development do
-  gem "guard-livereload", "~> 2.5", require: false
+  gem "guard-livereload", require: false
   gem "rack-livereload"
   gem "rack-mini-profiler", require: false
   gem "spring"

Gemfile.lock

@@ -551,28 +551,28 @@ DEPENDENCIES
   database_cleaner
   delayed_job_active_record
   dotenv-rails
-  dynamic_form (~> 1.1.4)
+  dynamic_form
   email_spec
   factory_bot_rails
   flutie
   font-awesome-rails
-  formtastic (~> 4.0.0)
+  formtastic
   friendly_id
-  gravatarify (~> 3.1.0)
-  guard-livereload (~> 2.5)
+  gravatarify
+  guard-livereload
   high_voltage
   inline_svg
   jquery-rails
   jquery-ui-rails
   kaminari
   launchy
   mime-types
-  mimemagic (~> 0.3.10)
-  neat (~> 1.9.1)
-  nokogiri (>= 1.6.7.2)
+  mimemagic
+  neat
+  nokogiri
   octokit
-  omniauth (~> 1.9.1)
-  omniauth-github (~> 1.4.0)
+  omniauth
+  omniauth-github
   paperclip
   pg
   pg_search
@@ -582,7 +582,7 @@ DEPENDENCIES
   rack-cors
   rack-livereload
   rack-mini-profiler
-  rack-rewrite (~> 1.5.1)
+  rack-rewrite
   rails
   rails-assets-lodash!
   rails-controller-testing
@@ -592,7 +592,7 @@ DEPENDENCIES
   redcarpet
   redis
   request_store
-  responders (~> 3.0)
+  responders
   rexml
   rspec-rails
   rspec_junit_formatter