Subscript and Superscript Icons
## Icon Request

* Icon name:  Subscript
* Tags of this icon: #subscript
* Use case: in Editor to trigger subscript of characters
* Screenshots of similar icons: used one of yours to remix ;-)
![subscript](https://user-images.githubusercontent.com/1113639/56264121-c2978d00-60e5-11e9-86b6-c4dd88c1bb10.png)
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* Icon name:  Superscript
* Tags of this icon: #superscript
* Use case: in Editor to trigger superscript of characters
* Screenshots of similar icons: used one of yours to remix ;-)
![superscript](https://user-images.githubusercontent.com/1113639/56264134-caefc800-60e5-11e9-9da5-36917880c5a0.png)
