Update x/text dep to v0.3.7

[sywhang]

This mitigates https://nvd.nist.gov/vuln/detail/CVE-2020-14040.

Fixes #121.

[codecov[bot]]

Codecov Report

Merging #122 (474f69f) into master (f57942f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   92.57%   92.57%           
=======================================
  Files           9        9           
  Lines         350      350           
=======================================
  Hits          324      324           
  Misses         16       16           
  Partials       10       10           

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[sywhang]

@abhinav do you have push rights here? GH says I don't have push rights and idk why.

[abhinav]

Unclear. Fixed.