Update changelog.txt with bug fix.
Update changelog.txt with bug fix.

danielpunkass/tinymce,FernCreek/tinymce,Shopify/tinymce,danielpunkass/tinymce,shilpi230/tinymce,rednose-public/tinymce,fashionsun/tinymce,blakewallan/tinymce,kencheung/tinymce,ETSI-CTI/TinySpecMCE,leofeyer/tinymce,TeamupCom/tinymce,fhchina/tinymce,kencheung/tinymce,leofeyer/tinymce,pmpl-5/tinymce,gabixdev/tinymce,1099511627776/tinymce,M4R7iNP/tinymce,ikuchmin/tinymce,jtark/tinymce,toxalot/tinymce,ice8lue/tinymce,gencer/tinymce,ChristophKaser/tinymce,henrythewasp/tinymce,bsuh/tinymce,fillabs/TinySpecMCE,nbcp/tinymce,adaptiffdesigns/tinymce,TeamupCom/tinymce,ChristophKaser/tinymce,sjbufton/tinymce,M4R7iNP/tinymce,jashua212/tinymce,tinymce/tinymce,1099511627776/tinymce,sjbufton/tinymce,tinymce/tinymce,adaptiffdesigns/tinymce,rxl194/tinymce,endjin/tinymce,gabixdev/tinymce,gencer/tinymce,aduth/tinymce,Razzwan/tinymce,simachewh/tinymce,sachgits/tinymce,rbecheras/tinymce,VioletLife/tinymce,Razzwan/tinymce,shilpi230/tinymce,dziemian007/tinymce,henrythewasp/tinymce,ikuchmin/tinymce,fhchina/tinymce,jashua212/tinymce,fashionsun/tinymce,simachewh/tinymce,enfold/tinymce,jtark/tinymce,sachgits/tinymce,MediehusetTek/tinymce,rbecheras/tinymce,bsuh/tinymce,howanghk/tinymce,FernCreek/tinymce,support-dot-com/tinymce,MediehusetTek/tinymce,mplank/tinymce,pmpl-5/tinymce,aduth/tinymce,nikolas/tinymce,danchr/tinymce,ETSI-CTI/TinySpecMCE,cclaerhout/tinymce,rednose-public/tinymce,collective/tinymce,Kindling/tinymce,nbcp/tinymce,danielpunkass/tinymce,dziemian007/tinymce,blakewallan/tinymce,Zimbra/tinymce,nikolas/tinymce,enfold/tinymce,Zimbra/tinymce,toxalot/tinymce,rxl194/tinymce,fillabs/TinySpecMCE,widgetfactory/tinymce,cclaerhout/tinymce,tinymce/tinymce,Kindling/tinymce,collective/tinymce,widgetfactory/tinymce,support-dot-com/tinymce,danchr/tinymce,ice8lue/tinymce,FernCreek/tinymce,mplank/tinymce,howanghk/tinymce,endjin/tinymce,VioletLife/tinymce