Fix: nullptr return values could lead to a crash

Signed-off-by: Tolga Cakir <[email protected]>

bumping version to 0.4.0

Signed-off-by: Tolga Cakir <[email protected]>

bumping version to 0.3.1 - bugfix release

version 0.3.0 - introducing support for Logitech G710+

bumping version to 0.2.1

bumping version to 0.2.0

Fix: using https URL instead of ssh for git submodule

Issue #1: SSL URL for submodule causes 'permission denied' for clone

using tinyxml2 static library, until tinyxml2 is widespread

added versioning, updated readme - ready for beta