Add __version__ to __init__ and update python dep in pyproject.toml

Author: aneeshnaik

pyproject.toml

@@ -9,7 +9,7 @@ authors = [
 ]
 description = "Efficient random sampling via linear interpolation."
 readme = "README.md"
-requires-python = ">=3.6"
+requires-python = ">=3.8"
 dependencies = [
   "numpy>=1.17,<2.0",
   "scipy>=1.9,<2.0",

src/lintsampler/__init__.py

@@ -1,4 +1,10 @@
 from .gridsample import gridsample
 from .sample import sample
+from importlib.metadata import version, PackageNotFoundError
+
+try:
+    __version__ = version("lintsampler")
+except PackageNotFoundError:
+    __version__ = "unknown version"
 
 __all__ = ["gridsample", "sample"]