add more autocommand events to re-detect markers

[rohieb]

Run the marker detection autocommand in the following cases that could add conflict markers to the buffer:

• when vim detects that the file in the current buffer has been changed externally (e.g. when executing a patch --merge < my.patch that patches the current file)

• when reading into the current buffer from stdin with :read

• when filtering the current buffer through a shell command with :!%

[codecov-commenter]

Codecov Report

Merging #19 (3674401) into master (6a9b8f9) will increase coverage by 0.96%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   97.11%   98.07%   +0.96%     
==========================================
  Files           3        3              
  Lines         208      208              
==========================================
+ Hits          202      204       +2     
+ Misses          6        4       -2     

Impacted Files	Coverage Δ
plugin/conflict_marker.vim	96.90% <100.00%> (ø)
autoload/conflict_marker.vim	98.96% <0.00%> (+1.03%)	:arrow_up:
autoload/conflict_marker/detect.vim	100.00% <0.00%> (+7.14%)	:arrow_up:

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[rhysd]

Thank you.

[rohieb]

Yay! *git-pulls master* 🙂 Do you think you could add the hacktoberfest-accepted label to this PR or the hacktoberfest topic to the repository to make it count for Hacktoberfest contributions?

[rhysd]

@rohieb I added hacktoberfest-accepted label 😃 It should work (if I'm correct). Please check the account page.

[rohieb]

Thank you! 🙂