Update to Ruby 2.3.3

.ruby-version

@@ -1 +1 @@
-2.3.1
+2.3.3

.travis.yml

@@ -10,6 +10,8 @@ rvm:
   - 2.2.4
   - 2.3.0
   - 2.3.1
+  - 2.3.2
+  - 2.3.3
 before_install:
   - "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"
 before_script:

README.md

@@ -99,7 +99,7 @@ Windows is not supported
 
 ## Prerequisites
 
-- Ruby >= 2.1.9 - Recommended: 2.3.1
+- Ruby >= 2.1.9 - Recommended: 2.3.3
 - Curl >= 7.21  - Recommended: latest - FYI the 7.29 has a segfault
 - RubyGems      - Recommended: latest
 - Git
@@ -136,8 +136,8 @@ https://rvm.io/integration/gnome-terminal#integrating-rvm-with-gnome-terminal
     curl -sSL https://get.rvm.io | bash -s stable
     source ~/.rvm/scripts/rvm
     echo "source ~/.rvm/scripts/rvm" >> ~/.bashrc
-    rvm install 2.3.1
-    rvm use 2.3.1 --default
+    rvm install 2.3.3
+    rvm use 2.3.3 --default
     echo "gem: --no-ri --no-rdoc" > ~/.gemrc
     gem install bundler
     git clone https://github.com/wpscanteam/wpscan.git