Release Name: PyNIDM v3.7.4 (dev) (v3.7.4)

Notes:
This minor update contains fixes for opening JSON sidecar files in read only mode (see issue https://github.com/incf-nidash/PyNIDM/is...) and adds support for tab-separated values files for csv2nidm tool (see issue: https://github.com/incf-nidash/PyNIDM/is...)