Bump the project version to 0.1.5

release.yml's preflight refuses a tag that does not name the version this
source reports -- `project(VERSION)` is hand-edited in a PR before the tag
is pushed, deliberately not derived from git -- so v0.1.5 cannot be tagged
until this line says 0.1.5.

What 0.1.5 carries since v0.1.4: the native PulseAudio and PipeWire output
backends, the stream hooks (--hook-start / --hook-stop) together with the
fixes that serialise them and keep their commands out of the log, the
identity flags (--id, --manufacturer, --product-name), the --audio-format
pin, and the end of SENDSPIN_SERVER_URL exporting a stale dialled URL.

Author: chrisuthe

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(sendspin-cpp-cli
-    VERSION 0.1.4
+    VERSION 0.1.5
     DESCRIPTION "Headless CLI/daemon Sendspin audio player"
     HOMEPAGE_URL "https://github.com/Sendspin/sendspin-cpp"
     LANGUAGES CXX