fix(README): include script's charset 
fix(README): include script's charset 

Closes #1938
isagalaev/highlight.js,carlokok/highlight.js,MakeNowJust/highlight.js,carlokok/highlight.js,highlightjs/highlight.js,carlokok/highlight.js,highlightjs/highlight.js,palmin/highlight.js,highlightjs/highlight.js,palmin/highlight.js,isagalaev/highlight.js,MakeNowJust/highlight.js,MakeNowJust/highlight.js,highlightjs/highlight.js,carlokok/highlight.js,palmin/highlight.js