Add FORGIT_CHERRY_PICK_FZF_OPTS

The gcp (git cherry pick) command was the only command which did not
have a variable to set command-specific fzf options. Add the according
variable to source code and documentation.

README.md

@@ -243,8 +243,9 @@ Customizing fzf options for each command individually is also supported:
 | `gss`    | `FORGIT_STASH_FZF_OPTS`           |
 | `gclean` | `FORGIT_CLEAN_FZF_OPTS`           |
 | `grb`    | `FORGIT_REBASE_FZF_OPTS`          |
-| `gbl`     | `FORGIT_BLAME_FZF_OPTS`          |
+| `gbl`    | `FORGIT_BLAME_FZF_OPTS`           |
 | `gfu`    | `FORGIT_FIXUP_FZF_OPTS`           |
+| `gcp`    | `FORGIT_CHERRY_PICK_FZF_OPTS`     |
 
 Complete loading order of fzf options is:
 

conf.d/forgit.plugin.fish

@@ -340,6 +340,7 @@ function forgit::cherry::pick -d "git cherry-picking" --argument-names 'target'
         --preview=\"$preview\"
         $FORGIT_FZF_DEFAULT_OPTS
         -m -0
+        $FORGIT_CHERRY_PICK_FZF_OPTS
     "
     echo $base
     echo $target

forgit.plugin.zsh

@@ -157,6 +157,7 @@ forgit::cherry::pick() {
         $FORGIT_FZF_DEFAULT_OPTS
         --preview=\"$preview\"
         -m -0
+        $FORGIT_CHERRY_PICK_FZF_OPTS
     "
     git cherry "$base" "$target" --abbrev -v | cut -d ' ' -f2- |
         FZF_DEFAULT_OPTS="$opts" fzf | cut -d' ' -f1 |