Wrap relationship where constraints to its own group
- docs(README): update docs url cf55342
- docs(README): use latest tag for npm badges 810ac07
- fix: raise exception when subprocess command fails 7a3bf85
- fix: quirks around grouping relationship where clauses e62dc5c
- improvement: wrap relationship where clause to its own group 6b55d5d
- fix: set belongsTo and hasOne relationship property to null or model instance 3f4973e