Added a dedicated CHANGES file.
Added a dedicated CHANGES file.

michaelcapizzi/processors,capdevc/processors,VivianLuwenHuangfu/processors,michaelcapizzi/processors,michaelcapizzi/processors,sistanlp/processors,capdevc/processors,VivianLuwenHuangfu/processors,capdevc/processors,sistanlp/processors,followyourheart/processors,followyourheart/processors,capdevc/processors,sistanlp/processors,VivianLuwenHuangfu/processors,VivianLuwenHuangfu/processors,michaelcapizzi/processors,followyourheart/processors,followyourheart/processors