Install pysam from bioconda

[jeromekelleher]

Closes #276

[codecov]

Codecov Report

Merging #278 into master will increase coverage by 4.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
+ Coverage    85.8%   89.94%   +4.13%     
==========================================
  Files          19       13       -6     
  Lines       14071     6633    -7438     
  Branches     2736     1310    -1426     
==========================================
- Hits        12074     5966    -6108     
+ Misses       1043      242     -801     
+ Partials      954      425     -529

Flag	Coverage Δ
#c_tests	?
#python_c_tests	89.94% <ø> (ø)	⬆️
#python_tests	99.17% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
c/tskit/genotypes.c
c/tskit/convert.c
c/tskit/stats.c
c/tskit/core.c
c/tskit/tables.c
c/tskit/trees.c

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 34cdc0f...c7e2474. Read the comment docs.

[codecov]

Codecov Report

Merging #278 into master will increase coverage by 4.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
+ Coverage    85.8%   89.94%   +4.13%     
==========================================
  Files          19       13       -6     
  Lines       14071     6633    -7438     
  Branches     2736     1310    -1426     
==========================================
- Hits        12074     5966    -6108     
+ Misses       1043      242     -801     
+ Partials      954      425     -529

Flag	Coverage Δ
#c_tests	?
#python_c_tests	89.94% <ø> (ø)	⬆️
#python_tests	99.17% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
c/tskit/genotypes.c
c/tskit/convert.c
c/tskit/stats.c
c/tskit/core.c
c/tskit/tables.c
c/tskit/trees.c

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 34cdc0f...c7e2474. Read the comment docs.