[UTI-2583] Adapt haste-client to the new API usage rules (#57)

.github/pull_request_template.md

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+[ABC-1234](https://toptal-core.atlassian.net/browse/ABC-1234)
+
+### Description
+
+Describe the changes and motivations for the pull request, unless obvious from the title.
+
+[Designs](https://share.abstract.com) (if applicable)
+
+### How to test
+
+- `bundle install`
+- FIXME: Add the steps describing how to test your changes manually
+
+### Environment variables
+
+Include a snapshot of the ENV vars used in your local env when this PR was created.
+
+```
+PUBLIC_ENV_VAR=public-value
+GLOBAL_SECRET_ENV_VAR=xxx # Added in 1Password in Shared-Utilities-Environment group
+OWN_PRIVATE_ENV_VAR # Different for everyone
+```
+
+### Acceptance Criteria
+
+- [ ] Add acceptance criterias from Jira task [ABC-1234]
+
+### Pre-merge checklist
+
+- [ ] The PR relates to a single subject with a clear title and description in grammatically correct, complete sentences.
+- [ ] Verify that feature branch is up-to-date with `master` (if not - rebase it).
+- [ ] Double check the quality of [commit messages](http://chris.beams.io/posts/git-commit/).
+- [ ] A snapshot of the author's env vars has been added

.github/workflows/unit.yml

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+name: Unit
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: 
+      - UTI-2583--adapt-haste-client-to-new-api
+
+jobs:
+  unit_tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-ruby@v1
+        with:
+          ruby-version: 3.0.0
+
+      - name: Run bundle install
+        run: |
+          gem install bundler
+          bundle install --jobs 4 --retry 3
+
+      - name: Build and test with rspec
+        run: bundle exec rspec spec