Package housekeeping

[pitkant]

• bumping the version number from 0.17.1 to 0.17.2
• adding @sampoves as a package contributor
• fixing the double header in citation("pxweb")
• update package NEWS

This should be merged after #282 and #284

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.78%. Comparing base (816e244) to head (b7d8420).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
+ Coverage   89.72%   89.78%   +0.06%     
==========================================
  Files          32       32              
  Lines        1829     1840      +11     
==========================================
+ Hits         1641     1652      +11     
  Misses        188      188              

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[pitkant]

I merged the PR #284 to this commit to see if the tests run correctly with increased timeout. There was a scb-related timeout here in GitHub whereas the tests worked normally on my own computer