Add version

Author: lidaof

Version.md

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+# Version History
+
+## 48.2.0
+
+* genome alignment track enhanced view, improved by Xiaoyu Zhuo
+* allow users to upload local file as tracks
+* allow users to upload entire folder or many files as a data hub by creating a `hub.config.json` file
+* HiC track normalization implemented by Silas Hsu
+
+## 47.2.8
+
+* first stable version since we start coding the new version of the browser code
+* embedding browser function is available
+* browser code also uploaded to npm
+* (version number prior to 47 refers to the old browser codebase)