Add configuration metadata for feign.autoconfiguration.jackson.enabled

[KENNYSOFT]

#430 haven't added configuration metadata for feign.autoconfiguration.jackson.enabled, so I added it.

I've seen #470, so defaultValue can be changed by next major release.

[codecov]

Codecov Report

Merging #478 (d838ed6) into 2.2.x (63ba4d4) will decrease coverage by 2.86%.
The diff coverage is 72.96%.

@@             Coverage Diff              @@
##              2.2.x     #478      +/-   ##
============================================
- Coverage     79.79%   76.92%   -2.87%     
- Complexity      428      436       +8     
============================================
  Files            57       54       -3     
  Lines          1653     1634      -19     
  Branches        232      242      +10     
============================================
- Hits           1319     1257      -62     
- Misses          238      256      +18     
- Partials         96      121      +25     

Impacted Files	Coverage Δ	Complexity Δ
...ringframework/cloud/openfeign/DefaultTargeter.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...work/cloud/openfeign/FeignClientSpecification.java	28.57% <0.00%> (+2.48%)	3.00 <0.00> (ø)
...ign/annotation/PathVariableParameterProcessor.java	42.85% <0.00%> (+1.94%)	4.00 <0.00> (ø)
...enfeign/annotation/QueryMapParameterProcessor.java	88.88% <ø> (ø)	4.00 <0.00> (ø)
...oud/openfeign/encoding/BaseRequestInterceptor.java	87.50% <ø> (ø)	3.00 <0.00> (ø)
...ding/FeignAcceptGzipEncodingAutoConfiguration.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
.../encoding/FeignContentGzipEncodingInterceptor.java	43.47% <0.00%> (+1.81%)	8.00 <0.00> (ø)
...adbalancer/FeignLoadBalancerAutoConfiguration.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...ork/cloud/openfeign/support/PageJacksonModule.java	59.25% <ø> (ø)	4.00 <0.00> (ø)
...cloud/openfeign/support/PageableSpringEncoder.java	78.57% <0.00%> (+1.82%)	14.00 <0.00> (ø)
... and 49 more

[OlgaMaciaszek]

@KENNYSOFT Thanks for submitting the PR. The change looks good to me, however, it would make sense to add it to the Hoxton release train as well. Could you submit these changes against 2.2.x instead of master? I will merge it straight away then.

[KENNYSOFT]

Ok I should rebase this branch. Please wait!

[OlgaMaciaszek]

@KENNYSOFT it might be easier to create a new branch based on 2.2.x and cherry-pick this (or even copy, since it's a small change).

[KENNYSOFT]

Yup just cherry-picked 😁

[KENNYSOFT]

Have no idea why CI fails and Codecov report did not update... maybe I should not force-push my branch 😭

[OlgaMaciaszek]

Don't worry about it. There seems to be an issue with our CircleCI build. It fails here, but passes locally and on Jenkins. Will have to fix it.