Bump version to 0.5.1

- Update version number in pyproject.toml from 0.5.0 to 0.5.1 to
  reflect the new patch release.

This prepares the package for the next release which includes the
async detection fix and Python 3.14 CI support.

Move examples to their own directory

- Remove example1.py and example2.py
- Add basic.py and advanced.py to examples -directory
- Update instructions for fetching Elspot prices with improved usage documentation in README.md.

Loosen pytz requirement

Bump vcrpy version

Add '__version__'

Update installation instructions to use PyPi

Bugfix to accidental data format change in 0.4.0 (#40)

Test and pylint -fixes (#38)

* Test and pylint -fixes
* Drop support for Python 3.9, just can't be arsed
* Remove coveralls for now, need to check later
* Remove pypy tests at least for now

Bump version to 0.3.3

Bump version to 0.3.2

Raises a CurrencyMismatch exception, if returned currency doesn't match the requested.