add Gravatar part in README, CHANGELOG, and exampleSite #56

CHANGELOG.md

@@ -4,8 +4,17 @@ This changelog mainly documented some major changes, updates or fixes (with cred
 
 __2018-11__
 
+* Per PR [#56](https://github.com/htr3n/hyde-hyde/commit/5ed13e17400bbc09a342b60fd50cd9fe3e6f1525), Gravatar pics can be used exclusively to `.Site.Params.authorimage` via the parameter `.Site.Params.social.gravatar`
+
+  * ```toml
+    [params.social]
+    	gravatar = "your.email@domain.com"
+    ```
+
 * Fix Hugo demo (issue [#53](https://github.com/htr3n/hyde-hyde/issues/53))
+
 * Fix mobile header (PR [#51](https://github.com/htr3n/hyde-hyde/pull/51): credits to [@gamingrobot](https://github.com/gamingrobot))
+
 * Add Utterances comments (PR [#50](https://github.com/htr3n/hyde-hyde/pull/50): credits to [@gamingrobot](https://github.com/gamingrobot))
 
 __2018-10__

README.md

@@ -83,6 +83,12 @@ __`Hyde-hyde`__ essentially inherits most of Hyde's [options](https://github.com
   	...
   ```
 
+  * Per PR [#56](https://github.com/htr3n/hyde-hyde/commit/5ed13e17400bbc09a342b60fd50cd9fe3e6f1525), Gravatar pics can be used exclusively to `.Site.Params.authorimage` via the parameter `.Site.Params.social.gravatar`
+
+    * ```toml
+      [params.social]
+      	gravatar = "your.email@domain.com"
+      ```
 
 ### Customisations
 

exampleSite/config.toml

@@ -28,7 +28,7 @@ theme = "hyde-hyde"
     #UtterancesRepo = "..." # https://utteranc.es/
     #UtterancesIssueTerm = "..." # pathname, url, title, og:title
     #UtterancesTheme = "..." # github-light or github-dark
-    
+
     # Table of contents
     #toc = none, "hugo", or "tocbot"
 
@@ -43,6 +43,7 @@ theme = "hyde-hyde"
     stackoverflow = "<username>"
     telegram = "<username>"
     email = "your-email@example.com"
+    # gravatar = "your-email@example.com"
 
 ## Main Menu
 [[menu.main]]