Made RelativeSpectralResponse importable on the top level of the package.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

pyrsr/__init__.py

@@ -3,6 +3,15 @@
 """Top-level package for pyrsr."""
 
 from .version import __version__
+from .rsr import RelativeSpectralResponse
 
 __author__ = """Daniel Scheffler"""
 __email__ = 'daniel.scheffler@gfz-potsdam.de'
+
+
+__all__ = [
+    '__author__',
+    '__email__',
+    '__version__',
+    'RelativeSpectralResponse'
+]