Merge pull request #169 from evert/patch-2

Update README.md

Author: joonty

README.md

@@ -131,7 +131,7 @@ Once in debugging mode, the following default mappings are available:
  * `<F6>`: stop debugging
  * `<F7>`: detach script from debugger
  * `<F9>`: run to cursor
- * `<F10>`: set line breakpoint
+ * `<F10>`: toggle line breakpoint
  * `<F11>`: show context variables (e.g. after "eval")
  * `<F12>`: evaluate variable under cursor
  * `:Breakpoint <type> <args>`: set a breakpoint of any type (see :help