Fixed error bar plot and add holding current to the recording plots

[codecov-commenter]

Codecov Report

Merging #147 (1545441) into master (eb5f5ae) will increase coverage by 0.34%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   63.07%   63.41%   +0.34%     
==========================================
  Files          34       34              
  Lines        2153     2154       +1     
==========================================
+ Hits         1358     1366       +8     
+ Misses        795      788       -7     

Impacted Files	Coverage Δ
bluepyefe/recording.py	64.70% <0.00%> (ø)
bluepyefe/plotting.py	85.48% <100.00%> (+5.80%)	:arrow_up:
bluepyefe/target.py	92.18% <100.00%> (ø)

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[darshanmandge]

Thanks. Works now! :tada: