Add changelog to spell out our changes.

Author: ericbeland

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+
+# Upcoming
+
+Performance, Page, and Network Assertions against the HAR.
+
+# [1.0.0]
+- Initial fork based on BrowserMob Proxy
+- HTTP/2 support via Netty 4.1.34 upgrade
+- Java 11 support
+- Upgrades to dependencies (mockito, etc)
+- Upgrade to an actively maintained, [LittleProxy](https://github.com/mrog/LittleProxy) fork
+- Switch to Gradle
+- Import a new, better HAR reader from https://github.com/sdstoehr/har-reader
+- Extend the har reader with filtering/finding capabilities
+- Modify every existing file by adding a header to ensure compliance with Apache License
+- Rename our fork to our own name, BrowserUp, as we will be investing in it heavily. 
+    We have no relation to BrowserMob, which was a company acquired by Neustar in 2010.