Freeze ebcc to 1.5.0

[obackhouse]

Freezes the ebcc version until #182 is addressed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.45%. Comparing base (d3527ed) to head (78bffa8).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   71.45%   71.45%   -0.01%     
==========================================
  Files         156      156              
  Lines       20876    20876              
  Branches     2951     2951              
==========================================
- Hits        14917    14916       -1     
- Misses       5092     5093       +1     
  Partials      867      867              

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[obackhouse]

Note that ebcc 1.6.0 is now released, so Vayesta tests will fail until this is approved

[basilib]

Looks good. Hopefully we can make a more complete fix to maintain compatibility soon.