Add ability to use Config without params

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

Base: 99.57% // Head: 99.57% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (c9e860d) compared to base (8cc9c42).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #131   +/-   ##
=========================================
  Coverage     99.57%   99.57%           
- Complexity      270      272    +2     
=========================================
  Files            22       22           
  Lines           705      706    +1     
=========================================
+ Hits            702      703    +1     
  Misses            3        3           

Impacted Files	Coverage Δ
src/Config.php	100.00% <100.00%> (ø)

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