Update compatibility test (#2009)

Add comment in requirements about h5py and anndata.

  #1963

.github/workflows/compatibility_tests.yml

@@ -29,7 +29,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.6, 3.7] # As of Oct 2020 Anndata is not compatible with 3.8
-        anndata-version: [0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4]
+        anndata-version: [0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5]
         test-suite: [smoke-test, smoke-test-annotations]
     steps:
     - uses: actions/checkout@v2

server/requirements.txt

@@ -12,7 +12,7 @@ flatbuffers>=1.11.0
 flatten-dict>=0.2.0
 fsspec>=0.4.4,<0.8.0
 gunicorn>=20.0.4
-h5py<3.0.0 # h5py returns bytes instead of str, which breaks many assumptions
+h5py<3.0.0 # h5py>=3.0.0 had a breaking change; there is a fix in anndata>=0.7.5
 numba>=0.49.1
 numpy>=1.15.0
 packaging>=20.0