QDAC2 current measurements should be returned as floats

[jpsecher]

No description provided.

[codecov-commenter]

Codecov Report

Merging #126 (8adfd35) into master (1038d28) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   19.42%   19.43%   +0.01%     
==========================================
  Files         121      121              
  Lines       14436    14438       +2     
==========================================
+ Hits         2804     2806       +2     
  Misses      11632    11632              

Impacted Files	Coverage Δ
qcodes_contrib_drivers/drivers/QDevil/QDAC2.py	96.33% <100.00%> (ø)
...rib_drivers/tests/QDevil/test_sim_qdac2_current.py	100.00% <100.00%> (ø)

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[jenshnielsen]

Thanks