feat: add json summary report #220
                
     Merged
            
            
          
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which generates report in
coverage/coverage-summary.jsonlike{ "total": { "lines": { "total": 3, "covered": 3, "skipped": 0, "pct": 100 }, "statements": { "total": 3, "covered": 3, "skipped": 0, "pct": 100 }, "functions": { "total": 1, "covered": 1, "skipped": 0, "pct": 100 }, "branches": { "total": 0, "covered": 0, "skipped": 0, "pct": 100 } }, "/Users/gleb/git/instrument-example/src/App.js": { "lines": { "total": 1, "covered": 1, "skipped": 0, "pct": 100 }, "functions": { "total": 1, "covered": 1, "skipped": 0, "pct": 100 }, "statements": { "total": 1, "covered": 1, "skipped": 0, "pct": 100 }, "branches": { "total": 0, "covered": 0, "skipped": 0, "pct": 100 } }, "/Users/gleb/git/instrument-example/src/index.js": { "lines": { "total": 2, "covered": 2, "skipped": 0, "pct": 100 }, "functions": { "total": 0, "covered": 0, "skipped": 0, "pct": 100 }, "statements": { "total": 2, "covered": 2, "skipped": 0, "pct": 100 }, "branches": { "total": 0, "covered": 0, "skipped": 0, "pct": 100 } } }