docs(CHANGELOG): copyedit
docs(CHANGELOG): copyedit

fix grammar in changelog

pSuwalski/angular-google-maps,caravancoop/angular2-google-maps,caravancoop/angular2-google-maps,SebastianM/angular-google-maps,tobper/angular2-google-maps,caravancoop/angular2-google-maps,tobper/angular2-google-maps,SebastianM/angular-google-maps,tobper/angular2-google-maps,SebastianM/angular2-google-maps,pSuwalski/angular-google-maps,SebastianM/angular2-google-maps,SebastianM/angular2-google-maps,pSuwalski/angular-google-maps