Add alternatives to get commit hash of initial revision

Author: munendrasn

README.md

@@ -545,6 +545,12 @@ git remote prune origin
  git rev-list --reverse HEAD | head -1
 ```
 
+
+__Alternatives:__
+```sh
+git rev-list --max-parents=0 HEAD
+```
+
 ## Visualize the version tree.
 ```sh
 git log --pretty=oneline --graph --decorate --all

tips.json

@@ -197,7 +197,8 @@
     "alternatives": ["git remote prune origin"]
 }, {
     "title": "Retrieve the commit hash of the initial revision.",
-    "tip": " git rev-list --reverse HEAD | head -1"
+    "tip": " git rev-list --reverse HEAD | head -1",
+    "alternatives": ["git rev-list --max-parents=0 HEAD"]
 }, {
     "title": "Visualize the version tree.",
     "tip": "git log --pretty=oneline --graph --decorate --all",