Replaced Travis with GHA, and added templates

Author: dragonmantank

.github/ISSUE_TEMPLATE.md

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+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Version used:
+* Environment name and version (e.g. PHP 5.4 on nginx 1.9.1):
+* Operating System and version:

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Example Output or Screenshots (if appropriate):
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the code style of this project.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have read the **CONTRIBUTING** document.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.

.github/workflows/build.yml

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+name: build
+on: [push, pull_request]
+jobs:
+    build:
+        runs-on: 
+            - ubuntu-latest
+        strategy:
+            matrix:
+                php: ['7.2', '7.3', '7.4']
+        steps:
+            - name: Configure Git
+              if: ${{ matrix.os == 'windows-latest' }}
+              run: |
+                  git config --system core.autocrlf false
+                  git config --ystem core.eol lf
+
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                php-version: ${{ matrix.php }}
+                extensions: json
+                tools: composer
+                coverage: xdebug
+
+            - name: Get Composer cache directory
+              id: composercache
+              run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            - name: Cache Composer dependencies
+              uses: actions/cache@v2
+              with:
+                path: ${{ steps.composercache.outputs.dir }}
+                key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+                restore-keys: ${{ runner.os }}-composer-
+
+            - name: Install dependencies
+              run: composer install --no-interaction --prefer-dist --no-progress --no-suggest ${{ matrix.composer-options }}
+
+            - name: Analyze & test
+              run: |
+                  vendor/bin/phpunit -v --configuration ./phpunit.xml.dist --coverage-clover=coverage.xml
+
+            - name: Run codecov
+              uses: codecov/codecov-action@v1