[3.x] fix truncate to delete items in collection

[Yahatix]

Make the truncate function only remove documents and not drop the collection

Resolves: #1306

[codecov-io]

Codecov Report

Merging #1993 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1993      +/-   ##
============================================
- Coverage     87.04%   87.03%   -0.01%     
  Complexity      667      667              
============================================
  Files            31       31              
  Lines          1521     1520       -1     
============================================
- Hits           1324     1323       -1     
  Misses          197      197              

Impacted Files	Coverage Δ	Complexity Δ
src/Jenssegers/Mongodb/Query/Builder.php	88.85% <100.00%> (-0.04%)	165.00 <1.00> (ø)

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[divine]

This should be pushed to develop branch not master, since this is a breaking change.

[Yahatix]

Sorry this is my first ever pull request and i'm not quite sure how to correct the things you guys have told me. How can i "append" a new commit to this pull request? Or should i make a new pr on the develop branch?

[Smolevich]

I think that you left this PR
@divine this is bug and i think that we should fix in release 3.6.3 based on branch master

[divine]

Sorry this is my first ever pull request and i'm not quite sure how to correct the things you guys have told me. How can i "append" a new commit to this pull request? Or should i make a new pr on the develop branch?

Just edit your https://github.com/Yahatix/laravel-mongodb and changes will be reflected here.

--
@Smolevich ok, no problem.

[divine]

Looks good, thank you @Yahatix

[codecov-commenter]

Codecov Report

Merging #1993 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1993      +/-   ##
============================================
- Coverage     86.89%   86.88%   -0.01%     
  Complexity      671      671              
============================================
  Files            31       31              
  Lines          1557     1556       -1     
============================================
- Hits           1353     1352       -1     
  Misses          204      204              

Impacted Files	Coverage Δ	Complexity Δ
src/Jenssegers/Mongodb/Query/Builder.php	89.06% <100.00%> (-0.03%)	170.00 <1.00> (ø)

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[divine]

@Smolevich any objections?