Update README.md

Apply zero-cost (#26)

Merge pull request #22 from mapbox/low-level-api

clang-format fix

create multiple tests to trigger #21

upgrade to llvm 5.0.1 + clang-format

use std::uint64_t (thanks clang-tidy)

ignore asm usage in catch.hpp

add to clean and distclean targets

apply clang-format

remove strategy to simplify API

remove std::string API - refs https://github.com/mapbox/gzip-hpp/pull/22#discussion_r175126559

template to avoid dep on std::string + ignore old world cast inside zlib macros

add sudo:required for sanitizer build - mapbox/node-cpp-skel#93

Remove pedantic semi colons