Update minimum supported 2.2.x Ruby release to be 2.2.6

Author: rastating

.ruby-version

@@ -1 +1 @@
-2.2.2
+2.2.6

.travis.yml

@@ -1,11 +1,8 @@
 language: ruby
 rvm:
-  - 2.2.0
-  - 2.2.1
-  - 2.2.2
-  - 2.2.3
-  - 2.2.4
-  - 2.3.0
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
 before_install:
   - "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"
 script: bundle exec rspec

README.md

@@ -4,7 +4,7 @@
 A Ruby framework for developing and using modules which aid in the penetration testing of WordPress powered websites and systems.
 
 ### What do I need to run it?
-Ensure that you have Ruby 2.2.x installed on your system and then install all required dependencies by opening a command prompt / terminal in the WPXF folder and running ```bundle install```.
+Ensure that you have Ruby >= 2.2.6 installed on your system and then install all required dependencies by opening a command prompt / terminal in the WPXF folder and running ```bundle install```.
 
 If bundler is not present on your system, you can install it by running ```gem install bundler```.