DEL: welcome sms to user signing up with mobile number

[dalmia]

Fixes #250

[codecov]

Codecov Report

Merging #251 (83d2a7d) into master (fb12485) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
+ Coverage   96.86%   96.92%   +0.06%     
==========================================
  Files         143      143              
  Lines        2680     2669      -11     
==========================================
- Hits         2596     2587       -9     
+ Misses         84       82       -2     

Impacted Files	Coverage Δ
users/views.py	96.77% <ø> (+1.46%)	⬆️
users/signals.py	100.00% <100.00%> (ø)

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