add first CHANGELOG with version information

Author: Sean Sain

CHANGELOG.md

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+## 2.0.0 (Unreleased)
+
+FEATURES:
+
+* **New Resource:** `sumologic_partition` [GH-79]
+* **New Resource:** `sumologic_field_extraction_rule` [GH-83]
+* **New Resource:** `sumologic_content` [GH-85]
+
+ENHANCEMENTS:
+
+* Travis running acceptance tests [GH-92]
+
+BUG FIXES:
+
+* resource/sumologic_partition: Fixes decomissioning of partitions [GH-86]