grammar/spelling
fixes grammar typo in ch 4, s/friend/friendly/
Merge pull request #205 from kongelaks/typo_fix

grammar/spelling
Merge pull request #206 from bmabey/ch4-typo

fixes grammar typo in ch 4, s/friend/friendly/
grammar typo fix in ch 5 s/not try/not trying/
Merge pull request #207 from bmabey/chapter5-grammar-fix

grammar typo fix in ch 5 s/not try/not trying/