Tektronix/AFG3000: use MultiType with combiner argument

[jakeogh]

Apply microsoft/Qcodes#3917 closes #115

[codecov-commenter]

Codecov Report

Merging #168 (6c89a14) into master (a34b69f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   18.80%   18.80%           
=======================================
  Files         123      123           
  Lines       15581    15581           
=======================================
  Hits         2930     2930           
  Misses      12651    12651           

Impacted Files	Coverage Δ
...codes_contrib_drivers/drivers/Tektronix/AFG3000.py	0.00% <ø> (ø)

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[jenshnielsen]

Thanks, As far as I can see the is was added in qcodes 0.33.0 can you increase the minimum version here https://github.com/QCoDeS/Qcodes_contrib_drivers/blob/master/setup.cfg#L33 to match that (from 0.29.0)