s/thermos_observe/thermos_observer/ in README.md
s/thermos_observe/thermos_observer/ in README.md

Reviewed at https://reviews.apache.org/r/17293/

crashlytics/aurora,rosmo/aurora,medallia/aurora,apache/aurora,crashlytics/aurora,mschenck/aurora,protochron/aurora,wfarner/aurora,crashlytics/aurora,apache/aurora,mkhutornenko/incubator-aurora,medallia/aurora,wfarner/aurora,wfarner/aurora,medallia/aurora,crashlytics/aurora,shahankhatch/aurora,rosmo/aurora,thinker0/aurora,mschenck/aurora,mschenck/aurora,kidaa/aurora,shahankhatch/aurora,medallia/aurora,rosmo/aurora,protochron/aurora,thinker0/aurora,thinker0/aurora,shahankhatch/aurora,mschenck/aurora,kidaa/aurora,rdelval/aurora,kidaa/aurora,wfarner/aurora,rosmo/aurora,medallia/aurora,mkhutornenko/incubator-aurora,shahankhatch/aurora,thinker0/aurora,apache/aurora,mschenck/aurora,shahankhatch/aurora,wfarner/aurora,rdelval/aurora,protochron/aurora,thinker0/aurora,rdelval/aurora,protochron/aurora,mkhutornenko/incubator-aurora,rosmo/aurora,kidaa/aurora,thinker0/aurora,rdelval/aurora,medallia/aurora,rdelval/aurora,rdelval/aurora,kidaa/aurora,wfarner/aurora,mkhutornenko/incubator-aurora,shahankhatch/aurora,kidaa/aurora,mkhutornenko/incubator-aurora,protochron/aurora,mschenck/aurora,apache/aurora,apache/aurora,apache/aurora,rosmo/aurora,protochron/aurora,crashlytics/aurora,crashlytics/aurora