Fix #253: Use AdcStart() before each ReadAnalog value

[dhineshkumarmcci]

Added AdcStart() call before each AdcGetValue() to read the Channel value. With long time run, this fixed the ?CatenaStm32L0::ReadAnalog(3): CatenaStm32L0_ReadAnalog() failed (5), as reported in issue #253

[terrillmoore]

@chwon64, can you please check?

[chwon64]

Looks good.

[terrillmoore]

I reverted this. We are required to update version numbers and documentation. This is not a new requirement. Please bear this in mind and update. Since this is not a release, the last (x.y.z.last) field of the version number must be advanced (but do not change x.y.z); and you must update the release history in README.md. If you review that, you'll see that for pre-releases I say:

HEAD contains the following changes.

• Fix ReadAnalog fails #253 by calling AdcStart() before each read.

Please bear this in mind, and check all other pending pull requests.

[dhineshkumarmcci]

@terrillmoore I have updated the version number and updated release history in README.md. Also I have submitted a new pull request #256 for the same.