Resolve github action issue (attempt 2)

[ken-oneill]

Proposal changes:

1. Allow two tests for get_datazone_lookup() and get_simd_lookup() to skip GitHub Actions CI
2. Set the 'opendatascot' R package as a development package rather than CRAN
3. To avoid losing track of changes, the package version has been incremented to 0.2.0 to account for all previous changes including the new geography functions recently added - get_datazone_lookup(), get_simd_lookup(), get_sspl_lookup() and add_geography()
4. In related to bullet point 4, a basic NEWS.md is created (quite late.)

The problems with GitHub Actions CI

As briefly described in the first two bullet points above, some GitHub Actions CI (standard) for R did not run successfully because (to the best of my knowledge):

• the opendatascot package is not a CRAN package
• two functions -- get_datazone_lookup() and get_simd_lookup() -- rely on a live SPARQL endpoint and then download a CSV file.

Expected outcome

All GitHub Actions CI for R should then pass.

Previous attempt(s)

One previous attempt tried to resolve the aforementioned GitHub Actions CI issues unsuccessfully - see the closed (not merged) pull request #31 which is almost identical to this request except that I did not account for the dependency on the config package the last time.

[ken-oneill]

Update to the proposal changes section above:

• Allow the test for add_geography to skip GitHub Actions CI because this test would also depend on get_datazone_lookup() too.

[c-riddoch]

All good. Particularly like the addition of news.md