Open url

[hoseppan]

Added example of opening URL into /examples/user_guide/Links.ipynb

[jbednar]

Looks good to me, thanks!

[codecov-io]

Codecov Report

Merging #607 into master will decrease coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #607     +/-   ##
=========================================
- Coverage   85.93%   85.53%   -0.4%     
=========================================
  Files          97       98      +1     
  Lines        8661     8733     +72     
=========================================
+ Hits         7443     7470     +27     
- Misses       1218     1263     +45

Impacted Files	Coverage Δ
panel/layout.py	83.36% <0%> (-4.46%)	⬇️
panel/io/server.py	42.25% <0%> (-3.06%)	⬇️
panel/io/embed.py	85.71% <0%> (-0.61%)	⬇️
panel/callbacks.py	30.43% <0%> (-0.52%)	⬇️
panel/__init__.py	100% <0%> (ø)	⬆️
panel/tests/widgets/test_input.py	100% <0%> (ø)	⬆️
panel/depends.py	45.45% <0%> (ø)
panel/widgets/input.py	97.92% <0%> (+0.11%)	⬆️

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