catch singular matrix errors in wald testing

v0.7.4

incremented batchglm requirement to 0.7.4

minor changes to numpy backend

v0.7.3

incremented batchglm dependency to 0.7.3

numpy backend support

Merge pull request #123 from theislab/tf2_compatibility

introduced numpy backend

improvements of continuous and constraint interface

v0.6.13

incremented batchglm version requirement to 0.6.8

Fixed bugs in pariwise t-test and rank test

fixed bug in .mean of pairwise test

if data was csr_matrix, then _mean was still a matrix which broke summary dataframes.

Removed remaining xarray references

v0.6.11

incremented batchglm requirement to 0.6.6

Fixed bugs in pairwise tests

• bugs produced fatal error in z-tests
• also fixed minor batchglm interface bugs that produced errors in a few other cases
• batchglm requirement v0.6.5

Fixed issue with pushing to pypi

v0.6.9

updated gitignore

Fixed rtfd bugs and adapted new batchglm typing interface

v0.6.8

incremented batchglm requirement

Fixed bug in docs

v0.6.7

added new batchglm version requirement to docs