Load hikari config properties file from classpath.

[puppylpg]

If one prefers load properties file from classpath, this(with a slash at the beginning) can be wired:

HikariConfig hikariConfig = new HikariConfig("/hikari.config.properties");

However, use ClassLoader.getResourceAsStream rather than Class.getResourceAsStream, the code makes sense:

HikariConfig hikariConfig = new HikariConfig("hikari.config.properties");

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev@c509ec1). Click here to learn what that means.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##             dev    #1384   +/-   ##
======================================
  Coverage       ?   75.02%           
  Complexity     ?      547           
======================================
  Files          ?       24           
  Lines          ?     1934           
  Branches       ?      261           
======================================
  Hits           ?     1451           
  Misses         ?      339           
  Partials       ?      144           

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/zaxxer/hikari/HikariConfig.java	79.26% <0.00%> (ø)	120.00 <0.00> (?)

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