Merge pull request #420 from redboltz/rel_10_2_0

Release 10.2.0

Merge pull request #407 from redboltz/update_to_10_1_0

Update version to 10.1.0.

Merge pull request #388 from redboltz/sansio6

Updated the version to 10.0.0.

Merge pull request #359 from redboltz/add_cmake_option_to_build_separ…

…ate_example

Added ASYNC_MQTT_BUILD_EXAMPLES_SEPARATE cmake option.

Merge pull request #355 from redboltz/fix_353

Fixed TLS shutdown timeout handling.

Merge pull request #347 from redboltz/fix_change_log_format

Fixed changelog format.

Merge pull request #322 from redboltz/fix_321

Fixed Boost requirement version.

Merge pull request #315 from redboltz/fix_313

Fix 313

Merge pull request #307 from redboltz/refine_doc10

Refined documents.

Merge pull request #252 from redboltz/refine_doc3

Refine doc3