Update read_header function to support EFM data Files

[agualdron]

EFM datafiles are generated by EFM140 Software which is part of the Gamry Software modules.
When I tried to parse an EFM .DTA file, no curves were detected by the parser.
The reason is because in this files the curve data starts after a "EFMCURVE" tag.

So, I add the letters "EFM" to the regex on the read_header function.
Now the EFM curve is detected and everything works fine.

Here is an example EFM file:
GEN_EFM_#3.DTA

[bcliang]

Thanks for the PR.

• Tests passed. As it's just a change to read_header I don't think a new test is necessary, so we should be all good to go.
• Before I merge the PR, please update the CHANGELOG as part of the PR. I made suggested changes in the attached
  CHANGELOG.md
• I don't have experience with EFM140 software. Any particular processing required to interpret the data? Should we create a subclass to handle EFM curves?

[agualdron]

Thanks for your review...

• The EFM files are quite simple and have some similarities with the LPR (Linear Polarization Resistance) files. I don't think a new test is necessary for the EFM files. LPR files are working well from the beginning, and don't have tests either.
• I already made a "commit" to branch "patch-1" with the updated changelog as you requested.
• For the use cases I'm working with this file, no further processing is required to parse the data. The data as returning by your amazing parser is just excellent.

Thank you very much for this software, and for allowing me to contribute at least a little bit.

[bcliang]

Thanks for your help, PR merged!

For your workflow, do you need the released sbin/wheel from pypi, or are you able to manage just building from source? I can cut new release today if needed. Otherwise, it might sit in master without a new release published to pypi until mid-May. I have been working on peak detection + area calculation with cyclic voltammetry experiments and was hoping to include that in the next release. Unfortunately, it's still a week or two out.

[agualdron]

Thanks!

I can build from source by now, it is not an issue....
I will look forward to the next release, and hope I can contribute more on this project...