Update README.md

[gregrahn]

Update Impala and Kudu URL

[codecov]

Codecov Report

Merging #1664 into master will decrease coverage by 2.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1664      +/-   ##
==========================================
- Coverage   89.91%   87.27%   -2.64%     
==========================================
  Files         185      185              
  Lines       27207    27207              
  Branches     2337     2337              
==========================================
- Hits        24463    23746     -717     
- Misses       2340     3054     +714     
- Partials      404      407       +3

Impacted Files	Coverage Δ
ibis/bigquery/tests/test_client.py	25.87% <0%> (-73.55%)	⬇️
ibis/bigquery/tests/test_compiler.py	39.89% <0%> (-60.11%)	⬇️
ibis/bigquery/udf/tests/test_udf_execute.py	28% <0%> (-54%)	⬇️
ibis/bigquery/client.py	42.91% <0%> (-52.37%)	⬇️
ibis/bigquery/compiler.py	58.82% <0%> (-38.61%)	⬇️
ibis/bigquery/tests/conftest.py	70.27% <0%> (-16.22%)	⬇️
ibis/bigquery/udf/api.py	80.48% <0%> (-14.64%)	⬇️
ibis/impala/compiler.py	91.04% <0%> (-5.75%)	⬇️
ibis/tests/all/test_temporal.py	95.45% <0%> (-4.55%)	⬇️
ibis/pandas/client.py	85.54% <0%> (-3.47%)	⬇️
... and 8 more

[cpcloud]

Thanks! Will merge later tonight.