Update (most) themes to use new ${ruby_version_prompt} variable.
diff --git a/themes/rainbowbrite/rainbowbrite.theme.bash b/themes/rainbowbrite/rainbowbrite.theme.bash
index e4424bb..1179230 100644
--- a/themes/rainbowbrite/rainbowbrite.theme.bash
+++ b/themes/rainbowbrite/rainbowbrite.theme.bash
@@ -11,9 +11,9 @@
   history -c
   history -r
   # displays user@server in purple
-  # PS1="$red$(scm_char) $purple\u@\h$reset_color:$blue\w$yellow$(scm_prompt_info)$(rvm_version_prompt) $black\$$reset_color "
+  # PS1="$red$(scm_char) $purple\u@\h$reset_color:$blue\w$yellow$(scm_prompt_info)$(ruby_version_prompt) $black\$$reset_color "
   # no user@server
-  PS1="$red$(scm_char) $blue\w$yellow$(scm_prompt_info)$(rvm_version_prompt) $black\$$reset_color "
+  PS1="$red$(scm_char) $blue\w$yellow$(scm_prompt_info)$(ruby_version_prompt) $black\$$reset_color "
   PS2='> '
   PS4='+ '
 }