remove iframe video from readme

Assets/FlashTools/Docs/README.md

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-##### Flash Animation Toolset
-
-Convert your flash animation for Unity easy!
-
-* [Usage video](http://www.youtube.com/watch?v=uE_XRWZ5KHA)
-
-* [Site](https://blackmatov.github.io/unity-assets/flash-animation-toolset)
-* [Web demo](https://blackmatov.github.io/unity-assets/flash-animation-toolset/demo)
-* [User guide](https://blackmatov.github.io/unity-assets/flash-animation-toolset/user-guide.html)
-
-* [Trial version](https://assetstore.unity.com/packages/tools/animation/flash-animation-toolset-trial-73896)
-* [Full version](https://assetstore.unity.com/packages/tools/animation/flash-animation-toolset-73323)
-
-###### Features
-* Support all transformations like 'rotation', 'skew' and 'scale' (except 3D)
-* Support all tweens(classic, motion and etc), keyframes and layers
-* Support mask layers
-* Support bitmap and vector graphics
-* Support all clip color effects like 'brightness', 'tint', 'alpha' and etc
-* Support most blending modes (all except Alpha and Erase)
-* Simple runtime API for controlling your animations in Unity
-* Automatic packing texture atlases of animations with different settings
-* Great performance with zero allocations in update loop
-* Frame labels to separate sequences in one timeline
-* Export marked "for export" clips and main timeline
-* Live preview of animations in the Unity editor
-
-Supports Unity 2017.4 (LTS) and newer, both Personal and Pro. Full C# source code included.
-
-Leave your rating for this Asset. It is very important for me and the development of the project :) Thank you!
-
-Samples use "Creative Commons CC0 1.0 Universal License" animations from [Glitch game](http://www.glitchthegame.com/public-domain-game-art)