[PostgreSQL]Fix version parse

[k1LoW]

Fix #278

[codecov]

Codecov Report

Merging #279 (c919348) into master (edd6235) will decrease coverage by 0.84%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
- Coverage   66.26%   65.41%   -0.85%     
==========================================
  Files          24       24              
  Lines        4028     4031       +3     
==========================================
- Hits         2669     2637      -32     
- Misses       1083     1122      +39     
+ Partials      276      272       -4     

Impacted Files	Coverage Δ
drivers/postgres/postgres.go	71.36% <40.00%> (-0.47%)	⬇️
datasource/datasource.go	21.67% <0.00%> (-12.17%)	⬇️

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