Add SpotBugs support

[airborn]

No description provided.

[codecov-commenter]

Codecov Report

Merging #745 (4dd2da6) into master (fc99c63) will decrease coverage by 0.55%.
The diff coverage is 59.22%.

@@             Coverage Diff              @@
##             master     #745      +/-   ##
============================================
- Coverage     71.79%   71.23%   -0.56%     
+ Complexity      657      650       -7     
============================================
  Files           213      214       +1     
  Lines          3038     3073      +35     
  Branches         82       85       +3     
============================================
+ Hits           2181     2189       +8     
- Misses          818      844      +26     
- Partials         39       40       +1     

Impacted Files	Coverage Δ
.../java/com/jvm_bloggers/JvmBloggersApplication.java	5.88% <0.00%> (-0.37%)	⬇️
...ava/com/jvm_bloggers/JvmBloggersConfiguration.java	100.00% <ø> (ø)
...etching/blog_posts/BlogPostsFetchingScheduler.java	25.00% <0.00%> (ø)
...va/com/jvm_bloggers/core/rss/SyndFeedProducer.java	60.71% <0.00%> (ø)
...fetchers/HttpRssFetcherWithoutSslVerification.java	3.70% <0.00%> (+0.13%)	⬆️
...tend/public_area/search_posts/SearchPostsPage.java	0.00% <0.00%> (ø)
...c_area/social_meta_data/DefaultSocialMetaData.java	90.00% <ø> (ø)
...a/social_meta_data/SocialMetaDataHeadRenderer.java	100.00% <ø> (ø)
...st_redirect/click_counter/ClickStoringService.java	10.00% <10.00%> (ø)
...ore/data_fetching/blog_posts/SingleRssChecker.java	11.11% <11.11%> (ø)
... and 17 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.