Revert "Updating changelog for version 1.7.0 (#174)"

This reverts commit f18c383.

Author: mattsb42-aws

CHANGELOG.md

@@ -1,35 +1,5 @@
 # Changelog
 
-## 1.7.0 -- unreleased
-
-### Deprecation Warnings
-* Deprecated `MasterKey` and `MasterKeyProvider`. Replace your usage of these classes with `Keyring`. See `StandardKeyrings` 
-for the built-in keyrings that replace `KmsMasterKeyProvider`, `JceMasterKey`, and `MultiProviderFactory`. 
-We still support using master key providers and are not removing them yet. 
-When we decide to remove them, we will communicate that as defined in our versioning policy.
-* Deprecated `encryptData`, `decryptData` and related methods in `AwsCrypto`. Replace your calls to these methods with
-calls to `AwsCrypto.encrypt(EncryptRequest)` and `AwsCrypto.decrypt(DecryptRequest)`.
-
-### Major Changes
-* Introduce `Keyring` interface, built in Keyring implementations, and 
- methods in AwsCrypto that use keyrings [PR #173](https://github.com/aws/aws-encryption-sdk-java/pull/173)
-
-### Patches
-* Validate final frame length does not exceed the frame size in the message header [PR #166](https://github.com/aws/aws-encryption-sdk-java/pull/166)
-
-### Maintenance
-* Update AWS Java SDK version from 1.11.561 to 1.11.677. [PR #147](https://github.com/aws/aws-encryption-sdk-java/pull/147)
-* Upgrade JUnit from 4.12 to 5.5.2 [PR #151](https://github.com/aws/aws-encryption-sdk-java/pull/151)
-* Upgrade Mockito from 2.28.1 to 3.1.0 [PR #142](https://github.com/aws/aws-encryption-sdk-java/pull/142)
-* Upgrade Bouncy Castle from 1.61 to 1.65 [PR #179](https://github.com/aws/aws-encryption-sdk-java/pull/179)
-
-### Documentation
-* Added new examples demonstrating how to use
-  APIs, keyrings, cryptographic materials managers, and master key providers. PRs
-   [#165](https://github.com/aws/aws-encryption-sdk-java/pull/165),
-   [#168](https://github.com/aws/aws-encryption-sdk-java/pull/168),
-   and [#170](https://github.com/aws/aws-encryption-sdk-java/pull/170).
-  
 ## 1.6.1 -- 2019-10-29
 
 ### Deprecation Warnings