Added --disable-binary flag to README

README

@@ -29,17 +29,18 @@ More details here: https://rvm.io/rvm/install/
 
 == Flags
 
---default      :: with 'rvm use X', sets the default ruby for new shells to X.
---debug        :: Toggle debug mode on for very verbose output.
---trace        :: Toggle trace mode on to see EVERYTHING rvm is doing.
---force        :: Force install, removes old install & source before install.
---summary      :: Used with rubydo to print out a summary of the commands run.
---latest       :: with gemset --dump skips version strings for latest gem.
---gems         :: with uninstall/remove removes gems with the interpreter.
---docs         :: with install, attempt to generate ri after installation.
---reconfigure  :: Force ./configure on install even if Makefile already exists.
---skip-gemsets :: with install, skip the installation of default gemsets.
---quiet-curl   :: Makes curl silent when fetching data
+--default         :: with 'rvm use X', sets the default ruby for new shells to X.
+--debug           :: Toggle debug mode on for very verbose output.
+--disable-binary  :: Install from source instead of using binaries
+--trace           :: Toggle trace mode on to see EVERYTHING rvm is doing.
+--force           :: Force install, removes old install & source before install.
+--summary         :: Used with rubydo to print out a summary of the commands run.
+--latest          :: with gemset --dump skips version strings for latest gem.
+--gems            :: with uninstall/remove removes gems with the interpreter.
+--docs            :: with install, attempt to generate ri after installation.
+--reconfigure     :: Force ./configure on install even if Makefile already exists.
+--skip-gemsets    :: with install, skip the installation of default gemsets.
+--quiet-curl      :: Makes curl silent when fetching data
 
 == Options