reformat README (+2 squashed commits)

Squashed commits:
[7a5d078] keep style for tutorials
[fb7d914] Revert "Added video tutorial to README (ChartsOrg#4286)"

This reverts commit a83588f.

Author: liuxuan30

Assets/ChartInSwift.png

@@ -47,22 +47,17 @@ In order to correctly compile:
    - You'll need to add `ChartsRealm` as a dependency too.
 
 ## 3rd party tutorials
-
 #### Video tutorials
 
-* Alex Nagy | [Rebeloper](https://www.youtube.com/rebeloper)
-<a href="https://www.youtube.com/watch?v=mWhwe_tLNE8&list=PL_csAAO9PQ8bjzg-wxEff1Fr0Y5W1hrum&index=5">
-  <img src="https://github.com/rebeloper/Charts/blob/master/Assets/ChartInSwift.png"
-      alt="Chart in Swift - Setting Up a Basic Line Chart Using iOS Charts">
-</a>
+* [Chart in Swift - Setting Up a Basic Line Chart Using iOS Charts(Alex Nagy)](https://www.youtube.com/watch?v=mWhwe_tLNE8&list=PL_csAAO9PQ8bjzg-wxEff1Fr0Y5W1hrum&index=5)
 
 #### Blog posts
-
 * [Using Realm and Charts with Swift 3 in iOS 10 (Sami Korpela)](https://medium.com/@skoli/using-realm-and-charts-with-swift-3-in-ios-10-40c42e3838c0#.2gyymwfh8)
 * [Creating a Line Chart in Swift 3 and iOS 10 (Osian Smith)](https://medium.com/@OsianSmith/creating-a-line-chart-in-swift-3-and-ios-10-2f647c95392e)
 * [Beginning Set-up and Example Using Charts with Swift 3](https://github.com/annalizhaz/ChartsForSwiftBasic)
 * [Creating a Radar Chart in Swift (David Piper)](https://medium.com/@HeyDaveTheDev/creating-a-radar-chart-in-swift-5791afcf92f0)
-* Want your tutorial to show here? Create a PR!
+
+Want your tutorial to show here? Create a PR!
 
 ## Troubleshooting