[FIX] Fixed broken raw-tag
[TOOLS] Added npm script `coverage-report` to create an html report
[FIX] Off-by-1 error in truncate filter
[TEST] Added filter test for objects having toString set to null
[TEST] Added filter test for array filters handling non-arrays
[TEST] Added tests for increment/decrement blocks
[TEST] Added tests for conditions and filters to increase test coverage