Merge pull request #497 from nemtech/update-readme-links

Update README links

Author: rg911

README.md

@@ -17,7 +17,7 @@ Due to a network upgrade with [catapult-server@Fushicho](https://github.com/nemt
 
 The upgrade to this package's [version v0.17.3](https://github.com/nemtech/symbol-sdk-typescript-javascript/releases/tag/v0.17.3) is mandatory for **fushicho compatibility**.
 
-You can find the complete changelog [here](CHANGELOG.md).
+Find the complete release notes [here](CHANGELOG.md).
 
 ## Requirements
 
@@ -35,32 +35,37 @@ npm install symbol-sdk rxjs
 
 ## Usage
 
-Surf the [NEM Developer Center][docs] to get started into NEM development. You will find self-paced guides and useful code snippets using the TypeScript/Javascript SDK.
+Surf the [documentation][docs] to get started into Symbol development.
+You will find self-paced guides and useful code snippets using the TypeScript/Javascript SDK.
 
 To get the full description of the available classes and their functions, check the [SDK reference][sdk-ref].
 
 ## Getting help
 
 Use the following available resources to get help:
 
-- [Symbol SDK Typescript/Javascript Reference][docs]
+- [Symbol Documentation][docs]
+- [Symbol SDK Typescript/Javascript Reference][sdk-ref]
+- Join the community [slack group (#sig-api)][slack] 
 - If you found a bug, [open a new issue][issues]
 
 ## Contributing
 
-This project is developed and maintained by NEM Foundation. Contributions are welcome and appreciated. You can find [symbol-sdk on GitHub][self].
+This project is developed and maintained by NEM Foundation.
 
-Feel free to start an issue or create a pull request. Check [CONTRIBUTING](CONTRIBUTING.md) before start.
+Contributions are welcome and appreciated. 
+Check [CONTRIBUTING](CONTRIBUTING.md) for information on how to contribute.
 
 You can also find useful notes for developers under our documentation [guidelines][guidelines] section.
 
 ## License
 
-Copyright (c) 2018-2019 NEM
+Copyright (c) 2018-present NEM
 Licensed under the [Apache License 2.0](LICENSE)
 
 [self]: https://github.com/nemtech/symbol-sdk-typescript-javascript
 [docs]: http://nemtech.github.io/getting-started/setup-workstation.html
 [issues]: https://github.com/nemtech/symbol-sdk-typescript-javascript/issues
-[sdk-ref]: http://nemtech.github.io/symbol-sdk-typescript-javascript
+[sdk-ref]: https://nemtech.github.io/references/typescript-sdk.html
 [guidelines]: https://nemtech.github.io/contribute/contributing.html#sdk
+[slack]: https://join.slack.com/t/nem2/shared_invite/enQtMzY4MDc2NTg0ODgyLWZmZWRiMjViYTVhZjEzOTA0MzUyMTA1NTA5OWQ0MWUzNTA4NjM5OTJhOGViOTBhNjkxYWVhMWRiZDRkOTE0YmU