Fix remaining GPL references, change travis -> gitlab status badge (#268)

* Fix remaining GPL license references

* Replace travis with gitlab badge

README.md

@@ -4,8 +4,8 @@
 | :----------------: | :------------------: | :--------------------: | :--------------: |
 | [![linux][a1]][a2] | [![codecov][c1]][c2] | [![coveralls][d1]][d2] | [![loc][e1]][e2] |
 
-[a1]: https://travis-ci.org/paritytech/ink.svg?branch=master
-[a2]: https://travis-ci.org/paritytech/ink
+[a1]: https://gitlab.parity.io/parity/ink/badges/master/build.svg
+[a2]: https://gitlab.parity.io/parity/ink/pipelines
 [c1]: https://codecov.io/gh/paritytech/ink/branch/master/graph/badge.svg
 [c2]: https://codecov.io/gh/paritytech/ink/branch/master
 [d1]: https://coveralls.io/repos/github/paritytech/ink/badge.svg?branch=master
@@ -150,4 +150,4 @@ Visit our [contribution guidelines](CONTRIBUTING.md) for more information.
 
 ## License
 
-The entire code within this repository is licensed under the [GPLv3](LICENSE). Please [contact us](https://www.parity.io/contact/) if you have questions about the licensing of our products.
+The entire code within this repository is licensed under the [Apache License 2.0](LICENSE). Please [contact us](https://www.parity.io/contact/) if you have questions about the licensing of our products.

abi/derive/Cargo.toml

@@ -3,7 +3,7 @@ name = "ink_abi_derive"
 version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
-license = "GPL-3.0"
+license = "APACHE-2.0"
 readme = "README.md"
 repository = "https://github.com/paritytech/ink"
 documentation = "https://substrate.dev/substrate-contracts-workshop/#/"