update draino helm image tag

[naeriaf]

Issue: #100

Current default image tag has read-only file system issues as described in issue.

[codecov]

Codecov Report

Merging #102 (8fa9667) into master (450a853) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #102   +/-   ##
=======================================
  Coverage   75.21%   75.21%           
=======================================
  Files           7        7           
  Lines         464      464           
=======================================
  Hits          349      349           
  Misses        101      101           
  Partials       14       14           

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[naeriaf]

fixes #100: draino helm image tag updated