REL: Make h5py optional

https://gitlab.com/caosdb/caosdb-advanced-user-tools/-/merge_requests/82

README_SETUP.md

@@ -12,6 +12,11 @@ Dependencies will be installed automatically if you use the below described proc
 - `caosdb>=0.4.0`                                      
 - `openpyxl>=3.0.0`
 - `xlrd>=1.2.0`
+-  `pandas>=1.2.0`
+- `numpy>=1.17.3`
+
+If you want to use the optional h5-crawler the following dependencies will be installed additionally:
+- `h5py>=3.3.0`
 
 For testing:
 - `tox`
@@ -21,6 +26,9 @@ For testing:
 - `pip install . --user`
 - `pip install tox --user`
 
+Optional h5-crawler:
+- `pip install .[h5-crawler] --user`
+
 ## Run Unit Tests
 `tox`