refactor: simplify package implementation

BREAKING CHANGE:

The programmatic interface for `get-pkg-repo` expects the package
contents to be an object and not a string. If calling `get-pkg-repo`,
pass the package content string to `JSON.parse` prior to calling
`get-pkg-repo`.

.circleci/config.yml

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+version: 2
+
+node_6: &node_6
+  docker:
+    - image: node:6@sha256:68d8ca89524a21200e6a3ec0948893f3fe2c9e807ecc2a74319fbee59a13d2c4
+
+node_8: &node_8
+  docker:
+    - image: node:8@sha256:d97f5bf54e016ad55dd0475f8710b99be14884ab1afcae8875f8092341264b0c
+
+node_next: &node_next
+  docker:
+    - image: node:latest@sha256:32d5d5435e5038028bd0c0871d256d5887b06c4315cb1a135bcf81e0735627c9
+
+test_plan: &test_plan
+  steps:
+    - checkout
+    - restore_cache:
+        keys:
+          - v1-dependencies_test_plan
+    - run: yarn install --frozen-lockfile
+    - save_cache:
+        paths:
+          - node_modules
+          - ${HOME}/.cache/yarn
+        key: v1-dependencies_test_plan
+    - run: yarn test
+    - run: $(yarn bin)/codecov || echo "CodeCov did not collect coverage reports"
+
+jobs:
+  node_6_test_plan:
+    <<: [*node_6, *test_plan]
+  node_8_test_plan:
+    <<: [*node_8, *test_plan]
+  node_next_test_plan:
+    <<: [*node_next, *test_plan]
+
+workflows:
+  version: 2
+  build:
+    jobs:
+      - node_6_test_plan
+      - node_8_test_plan
+      - node_next_test_plan

.codecov.yml

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+comment: off

.eslintrc

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+{
+  "extends": "@hbetts/eslint-config"
+}

.nycrc

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+{
+  "extends": "@hbetts/nyc-config"
+}

CONTRIBUTING.md

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+# Contributing
+
+## Getting Started
+
+Fork the repository to your own account and then clone the repository to a suitable location on your local machine.
+
+```bash
+git clone [YOUR FORK OF THE PROJECT]
+```
+
+To update the project from within the project's folder you can run the following command:
+
+```bash
+git pull --rebase
+```
+
+### Building
+
+Install the project's dependencies.
+
+```bash
+npm install
+```
+
+### Testing
+
+To run the project's tests run the following command:
+
+```bash
+npm test
+```
+
+## Feature Requests
+
+I'm always looking for suggestions to improve this project. If you have a suggestion for improving an existing feature, or would like to suggest a completely new feature, please file an issue with my [GitLab repository](https://github.com/conventional-changelog/get-pkg-repo/issues).
+
+## Bug Reports
+
+My project isn't always perfect, but I strive to always improve on that work. You may file bug reports on the [GitLab repository](https://github.com/conventional-changelog/get-pkg-repo/issues) site.
+
+## Pull Requests
+
+Along with my desire to hear your feedback and suggestions, I'm also interested in accepting direct assistance in the form of new code or documentation.
+
+Please feel free to file merge requests against my [github repository](https://gitlab.com/conventional-changelog/get-pkg-repo/merge_requests).