Add er.font option for png/jpg ER diagram

[k1LoW]

No description provided.

[codecov]

Codecov Report

Merging #243 into master will decrease coverage by 1.92%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
- Coverage   69.05%   67.13%   -1.93%     
==========================================
  Files          21       21              
  Lines        3623     3679      +56     
==========================================
- Hits         2502     2470      -32     
- Misses        878      970      +92     
+ Partials      243      239       -4     

Impacted Files	Coverage Δ
config/config.go	50.30% <0.00%> (ø)
output/gviz/gviz.go	19.56% <0.00%> (-30.44%)	⬇️
datasource/datasource.go	23.13% <0.00%> (-12.55%)	⬇️

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