Add release process document.

RELEASE_PROCESS.md

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+# The aquarius Release Process
+
+- Create a new local feature branch, e.g. `git checkout -b feature/bumpversion-to-v0.2.5`
+- Use the `bumpversion.sh` script to bump the project version. You can execute the script using {major|minor|patch} as first argument to bump the version accordingly:
+  - To bump the patch version: `./bumpversion.sh patch`
+  - To bump the minor version: `./bumpversion.sh minor`
+  - To bump the major version: `./bumpversion.sh major`
+- Commit the changes to the feature branch.
+- Push the feature branch to GitHub.
+- Make a pull request from the just-pushed branch.
+- Wait for all the tests to pass!
+- Merge the pull request into the `develop` branch.
+- To make a GitHub release (which creates a Git tag):
+  - Go to the aquarius repo's Releases page [https://github.com/oceanprotocol/aquarius/releases](https://github.com/oceanprotocol/aquarius/releases)
+  - Click "Draft a new release".
+  - For tag version, put something like `v0.2.5`
+  - For release title, put the same value (like `v0.2.5`).
+  - For the target, select the `develop` branch, or the just-merged commit.
+  - Describe the main changes. (In the future, these will come from the changelog.)
+  - Click "Publish release".
+- Travis will detect the release (a new tag) and run the deployment section of [.travis.yml](.travis.yml), i.e.
+
+  ```yaml
+  deploy:
+  provider: pypi
+  distributions: sdist bdist_wheel
+  user: ${PYPI_USER}
+  password: ${PYPI_PASSWORD}
+  on:
+    tags: true
+    repo: oceanprotocol/aquarius
+    python: 3.6
+  ```
+
+- Go to Travis and check the Travis job. It should deploy a new release to PyPI.
+- Check PyPI for the new release at [https://pypi.org/project/ocean-aquarius/](https://pypi.org/project/ocean-aquarius/)