fix: typo in help text

Fixes Minor typo in error message #238

Author: aslafy-z

helm-git-plugin.sh

@@ -56,7 +56,7 @@ git_try() {
 
 #git_cache_intercept(git_repo, git_ref)
 git_cache_intercept() {
-    _git_repo="${1?Missing git_repo as first parameer}"
+    _git_repo="${1?Missing git_repo as first parameter}"
     _git_ref="${2?Missing git_ref as second parameter}"
     debug "Trying to intercept for ${_git_repo}#${_git_ref}"
     repo_tokens=$(echo "${_git_repo}" | sed -E -e 's/[^/]+\/\/([^@]*@)?([^/]+)\/(.+)$/\2 \3/' -e 's/\.git$//g' )