2.1.0

<< breaking changes >>

• Fix object internal data type is float if msgpack format is float32 (#531)

<< recommended changes >>

• Add FLOAT64 type. Please use it instead of DOUBLE (#531)
• Add FLOAT32 type. Please use it instead of FLOAT (#531)

<< other updates >>

• Add iterator based parse/unpack function(experimental) (#553)
• Add [[deprecated]] attribute for C++14 (#552)
• Fix msgpack_unpack() return code (#548)
• Fix integer overflow (#547, #549, #550)
• Add example codes (#542)
• Add MSGPACK_NVP. You can use not only variable name but also any strings (#535)
• Fix and Improve build system (#532, #545)
• Fix gcc_atomic.hpp include path (#529, #530)
• Improve CI environment (#526)
• Improve documents (#524)
• Add msgpack_unpacker_next_with_size() function (#515)
• Fix as() applying condition (#511)
• Fix fbuffer write (#504)
• Add gcc bug workaround (#499)
• Improve object print (#497, #500, #505, #533)
• Remove some warnings (#495, #506, #508, #513, #528, #538, #545)