Install package on travis to correctly get version number

.travis.yml

@@ -26,6 +26,7 @@ before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
+  - python setup.py develop  # need to install to get version number
   
 script: python ./test.py
 

nd2reader/__init__.py

@@ -2,12 +2,12 @@ from os import path
 from nd2reader.reader import ND2Reader
 from nd2reader.legacy import Nd2
 
-#try:
-import importlib.metadata as importlib_metadata
-#except:
-#    import importlib_metadata
+try:
+    import importlib.metadata as importlib_metadata
+except:
+    import importlib_metadata
 
 try:
     __version__ = importlib_metadata.version(__name__)
 except:
-    raise ValueError('Unable to read version number')
+    print('Unable to read version number')