Documenting our changes per Apache license

PUREPORT_CHANGES.md

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+## Add QoS policy support
+
+Date: Jan 4 2019
+
+Author: Jeremy Maness
+
+Commit: 1e007b18681d89a262ba8d5df07d1d477a0661a9
+
+## Add support for assigning fixed IP address to a network port
+
+Date: Jan 14 2019
+
+Author: Jeremy Maness
+
+Commit: 09feaaca6065e586138f4bf961cfdb2f9bc1732a
+
+## Make network MTU adjustable
+
+Date: Mar 5 2019
+
+Author: Jeremy Maness
+
+Commit: 37bff3d81468547b64506d3d46c7329298f5d20f
+
+## Add support for Compute API 2.15 to server groups
+
+Date: Sep 9 2019
+
+Author: Matt Traynham
+
+Commit: cb50a35ab1e617dbd3de1db7afde88c1b8fe0492
+
+## Add support for layer 2 gateways and connections
+
+Date: Nov 1 2019
+
+Author: Josh Poth
+
+Commit: 9b6c52fa1e24f785f81a118845d9dac99e8d49ad