Made Multiline-Icons customizable.

README.md

@@ -343,6 +343,11 @@ Here is what it looks like:
 
 ![](http://bhilburn.org/content/images/2015/03/double-line.png)
 
+If you want other icons, you can set the following variables in your `~/.zshrc`:
+
+    POWERLEVEL9K_MULTILINE_FIRST_PROMPT_PREFIX="↱"
+    POWERLEVEL9K_MULTILINE_SECOND_PROMPT_PREFIX="↳ "
+
 #### Light Color Theme
 
 If you prefer to use "light" colors, simply set `POWERLEVEL9K_COLOR_SCHEME`

powerlevel9k.zsh-theme

@@ -622,8 +622,11 @@ powerlevel9k_init() {
   add-zsh-hook precmd vcs_info
 
   if [[ "$POWERLEVEL9K_PROMPT_ON_NEWLINE" == true ]]; then
-    PROMPT="╭─%{%f%b%k%}"'$(build_left_prompt)'" 
-╰─ "
+    [[ -n $POWERLEVEL9K_MULTILINE_FIRST_PROMPT_PREFIX ]] || POWERLEVEL9K_MULTILINE_FIRST_PROMPT_PREFIX="╭─"
+    [[ -n $POWERLEVEL9K_MULTILINE_SECOND_PROMPT_PREFIX ]] || POWERLEVEL9K_MULTILINE_SECOND_PROMPT_PREFIX="╰─ "
+
+    PROMPT="$POWERLEVEL9K_MULTILINE_FIRST_PROMPT_PREFIX%{%f%b%k%}"'$(build_left_prompt)'"
+$POWERLEVEL9K_MULTILINE_SECOND_PROMPT_PREFIX"
     # The right prompt should be on the same line as the first line of the left
     # prompt.  To do so, there is just a quite ugly workaround: Before zsh draws
     # the RPROMPT, we advise it, to go one line up. At the end of RPROMPT, we