Add CHANGELOG

CHANGELOG.md

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+# CHANGELOG for sumologic-aws-lambda functions 
+
+This file lists changes made in each version of function repo
+
+## 1.2.0:
+Feb 29, 2016
+* Merged [PR#4](https://github.com/SumoLogic/sumologic-aws-lambda/pull/4), add LICENSE file, and a function for reading from S3. 
+
+## 1.1.1:
+Feb 22, 2016
+* Merged [PR#3](https://github.com/SumoLogic/sumologic-aws-lambda/pull/3), add strict equality comparison operator in the Lambda function for Lambda logs
+
+## 1.1.0:
+Feb 3, 2016
+* Merged [PR#2](https://github.com/SumoLogic/sumologic-aws-lambda/pull/2), add a function for reading from AWS Kinesis 
+
+## 1.0.0:
+Jan 25, 2016
+* Initial release with 2 functions for reading from AWS CloudWatch Logs (VPC and Lambda function logs)
+
+
+- - -
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