Coveralls code coverage is shown incorrectly as 100%

The code coverage widget shows 100% when the code coverage is currently 99.87% (https://coveralls.io/github/cpputest/cpputest?branch=master). The rounding must be changed to only show 100% when it is exactly 100%. I believe that is often done by code coverage tools to ensure that you do not mistakenly believe that there is 100% coverage.
