Prepare to release 0.3.2. (guangie88#68)

Update CHANGELOG.md to include 0.3.1 changes. (guangie88#66)

Prep to release 0.3.0 (guangie88#48)

cmake: cpptoml allow usage of installed dependency (guangie88#40)

* cmake: cpptoml allow usage of installed dependency

* CMakeLists.txt fix

* fixes build errors

* cmake: Added option "SPDLOG_SETUP_CPPTOML_EXTERNAL" to allow cpptoml library as installed dependency.

* build fix

* cmake: cleanup

* cmake: wrong option in "configure_file"

* unit_test.cpp fix

* cmake: travis and appveyor tests extended

* travis.yml : tabs removed

* fix travis test

* cmake: clear tab and newline characters.

* Additional description

* cmake: move cpptoml_config.h.in to cmake folder
cmake: add option SPDLOG_SETUP_INCLUDE_UNIT_TESTS
travis: build script adjusted

* fix travis

* travis: revert changes

* clang-format fix

Fix to support spdlog v1.y.z (guangie88#28)

* Fix general breaking file sinks breaking changes in spdlog v1.0.0

* Fix syslog test cases

* Remove all third_party/fmt and use spdlog/fmt instead

* Pin to latest spdlog v1.2.1 to indicate last working version

* Fix v1.3.0 and v1.3.1 enum issue and pin v1.3.1

* Add more details to CHANGELOG

* Make syslog include to be within non-Windows side only

* Shift using keywords for syslog

* Bump alpha version

Fix linking issue due to missing inline keywords (guangie88#15)

* Add missing inline keywords

* Bump version

* Add version number to appveyor

Add override file feature with simple logger saving and deletion (gua…

…ngie88#14)

* Bump version and from_files functions

* Add persist_logger

* Add all essential functions for load, save and reset for override

* Add from_file_and_override impl

* Implement template reading for base + override

* Implement saving of logger

* Add delete_logger_in_file

* Split code into multiple files

* Redo merge TOML config values

* Clean up some code

* Merge more override items and add unit test

* Switch to more complex unit test

* Use compile time content for unit tests

* Add unit tests for save_logger_to_file

* Add unit tests for delete_logger_in_file

* Add more unit tests to save_logger_to_file

* Fix from_file_and_override to not require override file

* Fix from_file_and_override_with_tag_replacement

* Add more unit tests for from_file_and_override_with_tag_replacement

* Fix gcc 4.9

* Attempt to fix MSVC error

* Another attempt to fix MSVC PATTERN issue

* Fix codecov ignore pattern

* Attempt to fix CMake build for MSVC for thread lib

Change from sum type to exception based API. (guangie88#10)

* Shifted cpptoml and fmt into part of project.

* Made changes to README.md.

* Changed implementation to exception based.

* Removed rustfp from deps.

* Down required compiled version to 11 instead of 14.

* Updated README.md and try older compilers in CI config.

Switched to Catch2 for unit testing. (guangie88#9)

* Removed Catch.

* Added Catch2 submodule.

* Removed --force-colour for Catch2.