Filter-ngFor example

[Denfie]

I changed a little bit the dragula.provider to check if there is a filter-index and if is defined choose this value. If it isn't defined choose default index.

I often use this because I have often unsorted lists.

[codecov[bot]]

Codecov Report

Merging #809 into master will not change coverage. The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #809   +/-   ##
=======================================
  Coverage   43.47%   43.47%           
=======================================
  Files           9        9           
  Lines         161      161           
  Branches       17       18    +1     
=======================================
  Hits           70       70           
  Misses         90       90           
  Partials        1        1

Impacted Files	Coverage Δ
src/components/dragula.provider.ts	14.66% <0%> (ø)	:arrow_up:

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