add formatAST() for formatting ASTs directly (#393)
add formatAST() for formatting ASTs directly (#393)


danharper/prettier,prettier/prettier,lydell/prettier,lydell/prettier,existentialism/prettier,prettier/prettier,Skywalker13/prettier-space-parenthesis,Pajn/prettier,existentialism/prettier,arijs/prettier-miscellaneous,existentialism/prettier,arijs/prettier-with-tabs,rattrayalex/prettier,azz/prettier,arijs/prettier-with-tabs,rattrayalex/prettier,azz/prettier,yamafaktory/prettier,azz/prettier,Skywalker13/prettier-space-parenthesis,Skywalker13/prettier-space-parenthesis,Pajn/prettier,arijs/prettier-miscellaneous,lydell/prettier,rattrayalex/prettier,arijs/prettier-miscellaneous,azz/prettier,yamafaktory/prettier,despairblue/prettier,prettier/prettier,despairblue/prettier,Skywalker13/prettier-space-parenthesis,jlongster/prettier,vjeux/prettier,arijs/prettier-miscellaneous,prettier/prettier,existentialism/prettier,lydell/prettier