bundler: update README with latest changes

plugins/bundler/README.md

@@ -2,7 +2,8 @@
 
 - adds completion for basic bundler commands
 - adds short aliases for common bundler commands
-  - `be` aliased to `bundle exec`
+  - `be` aliased to `bundle exec`.  
+    It also supports aliases (if `rs` is `rails server`, `be rs` will bundle-exec `rails server`).
   - `bl` aliased to `bundle list`
   - `bp` aliased to `bundle package`
   - `bo` aliased to `bundle open`
@@ -13,7 +14,8 @@
   - looks for a binstub under `./bin/` and executes it (if present)
   - calls `bundle exec <gem executable>` otherwise
 
-For a full list of *common gems* being wrapped by default please look at the `bundler.plugin.zsh` file.
+Common gems wrapped by default (by name of the executable):
+`annotate`, `cap`, `capify`, `cucumber`, `foodcritic`, `guard`, `hanami`, `irb`, `jekyll`, `kitchen`, `knife`, `middleman`, `nanoc`, `pry`, `puma`, `rackup`, `rainbows`, `rake`, `rspec`, `shotgun`, `sidekiq`, `spec`, `spork`, `spring`, `strainer`, `tailor`, `taps`, `thin`, `thor`, `unicorn` and `unicorn_rails`.
 
 ## Configuration