Added source profile support

[victorskl]

• Allow sync if source profile is SSO profile
• Warn only if profile is not SSO or no source profile avail
• Added --default-only flag to sync default profile only
• Modified --default flag to sync default and named profiles
• Minor refactor and added correspondent tests
• Bump version 0.4.0rc1

[codecov[bot]]

Codecov Report

Merging #10 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          162       181   +19     
=========================================
+ Hits           162       181   +19     

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

Impacted Files	Coverage Δ
yawsso/cli.py	100.00% <100.00%> (ø)

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