Ensure we use the same function definition syntax everywhere

CONTRIBUTING.md

@@ -30,7 +30,7 @@ there are a number of additional things to keep in mind.
 
    - Local variables should be used whenever possible.
    - Prefer `zstyle` over environment variables for configuration.
-   - Use the `my_func()` syntax for defining functions.
+   - Use the function keyword to define functions.
    - The 80 character hard limit can be waved for readability.
 
 #### Using an Alternative zprezto Directory

init.zsh

@@ -20,7 +20,8 @@ unset min_zsh_version
 # zprezto convenience updater
 # The function is surrounded by ( ) instead of { } so it starts in a subshell
 # and won't affect the environment of the calling shell
-function zprezto-update () (
+function zprezto-update {
+  (
     function cannot-fast-forward {
       local STATUS="$1"
       [[ -n "${STATUS}" ]] && printf "%s\n" "${STATUS}"
@@ -63,6 +64,7 @@ function zprezto-update () (
     fi
     return 1
   )
+}
 #
 # Module Loader
 #