add change by content search tip

Author: eliranm

README.md

@@ -13,6 +13,7 @@ P.S: All these commands are tested on `git version 2.7.4 (Apple Git-66)`.
 <!-- Don’t remove or change the comment above – that can break automatic updates. -->
 * [Everyday Git in twenty commands or so](#everyday-git-in-twenty-commands-or-so)
 * [Show helpful guides that come with Git](#show-helpful-guides-that-come-with-git)
+* [Search change by content](#search-change-by-content)
 * [Overwrite pull](#overwrite-pull)
 * [List of all files till a commit](#list-of-all-files-till-a-commit)
 * [Git reset first commit](#git-reset-first-commit)
@@ -179,6 +180,11 @@ git help everyday
 git help -g
 ```
 
+## Search change by content
+```sh
+git log -S'<a term in the source>'
+```
+
 ## Overwrite pull
 ```sh
 git fetch origin && git reset --hard origin/master

tips.json

@@ -4,6 +4,9 @@
 }, {
     "title": "Show helpful guides that come with Git",
     "tip": "git help -g"
+}, {
+    "title": "Search change by content",
+    "tip": "git log -S'<a term in the source>'"
 }, {
     "title": "Overwrite pull",
     "tip": "git fetch origin && git reset --hard origin/master"