need to cast classId to str when saving PlotPrecisionRecallCurve

[SarBH]

            if savePath is not None:
                plt.savefig(os.path.join(savePath, classId + '.png'))

throws:

File "/tmp/sources/rafaelpadilla-Object-Detection-Metrics/lib/Evaluator.py", line 287, in PlotPrecisionRecallCurve
    plt.savefig(os.path.join(savePath, classId + '.png'))
TypeError: unsupported operand type(s) for +: 'int' and 'str'

[rafaelpadilla]

Hi @SarBH,

Fix this problem by making classId as string the line to:
plt.savefig(os.path.join(savePath, str(classId) + '.png'))

[github-actions]

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