Add all testable files to coverage report

Jest, by default, doesn't know what files COULD be tested which just
meant that coverage reports would omit any untested file.  This is
ironic because that meant you could have 100% coverage by simply not
testing anything.

Author: slifty

jest.config.js

@@ -4,6 +4,7 @@ module.exports = {
       tsconfig: 'tsconfig.dev.json',
     },
   },
+  collectCoverageFrom: ["src/**/*.ts"],
   preset: 'ts-jest',
   testEnvironment: 'node',
   testPathIgnorePatterns: ["<rootDir>/dist/"],