Add default values to SwallowedException rule

[juliabirkett]

There are some rules that have default values in the documentation but those values are not implemented in the code.
This is a bug mapped here #2597

This PR adds default values to SwallowedException rule as mapped in the documentation.

---

⚠️ This is my very first contribution to OS so sorry if I'm doing anything wrong. If this PR is OK, I'm gonna add more default values to other rules.

[BraisGabin]

First of all, thank you to take the time to fix this issue! I added some comment below

[BraisGabin]

LGTM! Great first contribution :)

The error that you are getting in CI is kind of odd. I think that what happen is that you need to add the imports for java.net.MalformedURLException and java.text.ParseException because they are not imported by default. You can test it in your computer with:
./gradlew :detekt-rules:test -Pcompile-test-snippets=true

By default the code in the snippets is not compiled, it's only compiled in the ubuntu/java8.

[schalkms]

Thanks for the nice 1st contribution! No worries. Everyone starts out as a 1st time contributor someday. I have a few comments regarding your PR.
If you have questions, please ping me directly.

It's nice to hear that you want to help out further with subsequent PRs. That's cool! 🙂

[arturbosch]

@juliabirkett @schalkms I've added a commit to get this into the next release soon :)

[codecov]

Codecov Report

Merging #2661 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #2661      +/-   ##
============================================
+ Coverage     80.44%   80.45%   +0.01%     
  Complexity     2303     2303              
============================================
  Files           378      378              
  Lines          6949     6954       +5     
  Branches       1262     1262              
============================================
+ Hits           5590     5595       +5     
  Misses          729      729              
  Partials        630      630              

Impacted Files	Coverage Δ	Complexity Δ
...osch/detekt/rules/exceptions/SwallowedException.kt	74.50% <100.00%> (+2.77%)	17.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e1f213b...dddfa17. Read the comment docs.