Bumping version from 0.8.4rc0 to 0.8.4

Author: github-actions[bot]

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ScopeSim"
-version = "0.8.4rc0"
+version = "0.8.4"
 description = "Generalised telescope observation simulator"
 license = "GPL-3.0-or-later"
 authors = ["Kieran Leschinski <[email protected]>"]