support loading properties file in unnamed resources module.

[arjenzhou]

#1826

[codecov[bot]]

Codecov Report

Merging #1827 (d692f0e) into dev (ed2da5f) will decrease coverage by 0.24%. The diff coverage is 75.00%.

@@             Coverage Diff              @@
##                dev    #1827      +/-   ##
============================================
- Coverage     70.75%   70.50%   -0.25%     
  Complexity      575      575              
============================================
  Files            26       26              
  Lines          2171     2177       +6     
  Branches        311      312       +1     
============================================
- Hits           1536     1535       -1     
- Misses          484      492       +8     
+ Partials        151      150       -1     

Impacted Files	Coverage Δ
src/main/java/com/zaxxer/hikari/HikariConfig.java	77.62% <75.00%> (+0.09%)	:arrow_up:
src/main/java/com/zaxxer/hikari/pool/PoolBase.java	69.96% <0.00%> (-2.20%)	:arrow_down:
...n/java/com/zaxxer/hikari/pool/ProxyConnection.java	77.84% <0.00%> (-0.64%)	:arrow_down:
...ain/java/com/zaxxer/hikari/util/ConcurrentBag.java	76.59% <0.00%> (+1.06%)	:arrow_up:

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[arjenzhou]

ping @brettwooldridge