drop ruby 1.9 support, whitespaces

README.md

@@ -92,7 +92,7 @@ WPScan comes pre-installed on the following Linux distributions:
 
 Prerequisites:
 
-- Ruby >= 1.9.2 - Recommended: 2.3.0
+- Ruby >= 2.0.0 - Recommended: 2.3.0
 - Curl >= 7.21  - Recommended: latest - FYI the 7.29 has a segfault
 - RubyGems      - Recommended: latest
 - Git
@@ -156,8 +156,8 @@ Apple Xcode, Command Line Tools and the libffi are needed (to be able to install
     curl -sSL https://get.rvm.io | bash -s stable
     source ~/.rvm/scripts/rvm
     echo "source ~/.rvm/scripts/rvm" >> ~/.bashrc
-    rvm install 2.2.4
-    rvm use 2.2.4 --default
+    rvm install 2.3.0
+    rvm use 2.3.0 --default
     echo "gem: --no-ri --no-rdoc" > ~/.gemrc
     gem install bundler
     git clone https://github.com/wpscanteam/wpscan.git
@@ -192,7 +192,7 @@ Apple Xcode, Command Line Tools and the libffi are needed (to be able to install
 
       Then, open the directory of the readline gem (you have to locate it)
 
-        cd ~/.rvm/src/ruby-1.9.2-p180/ext/readline
+        cd ~/.rvm/src/ruby-XXXX/ext/readline
         ruby extconf.rb
         make
         make install