minor #33860 Delete 5_Security_issue.md, in favor of GitHub SECURITY.md (ro0NL)
minor #33860 Delete 5_Security_issue.md, in favor of GitHub SECURITY.md (ro0NL)

This PR was merged into the 4.3 branch.

Discussion
----------

Delete 5_Security_issue.md, in favor of GitHub SECURITY.md

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", if any -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

This seems kinda duplicate today:

![image](https://user-images.githubusercontent.com/1047696/66231230-45d58b00-e6e6-11e9-8cde-50e05c0080df.png)

(https://github.com/symfony/symfony/issues/new/choose)

Commits
-------

84d62eb317 Delete 5_Security_issue.md

Taluu/symfony,jakzal/symfony,bendavies/symfony,HeahDude/symfony,chalasr/symfony,chalasr/symfony,jvasseur/symfony,chalasr/symfony,romaricdrigon/symfony,jakzal/symfony,mpdude/symfony,mpdude/symfony,paradajozsef/symfony,docteurklein/symfony,maidmaid/symfony,fabpot/symfony,nicolas-grekas/symfony,lyrixx/symfony,jakzal/symfony,zerkms/symfony,lstrojny/symfony,Deamon/symfony,nicolas-grekas/symfony,xabbuh/symfony,Nyholm/symfony,zorn-v/symfony,gonzalovilaseca/symfony,ogizanagi/symfony,MatTheCat/symfony,mnapoli/symfony,d-ph/symfony,phramz/symfony,sgehrig/symfony,zorn-v/symfony,kbond/symfony,derrabus/symfony,ragboyjr/symfony,d-ph/symfony,lyrixx/symfony,Deamon/symfony,maidmaid/symfony,hhamon/symfony,sgehrig/symfony,damienalexandre/symfony,docteurklein/symfony,derrabus/symfony,phramz/symfony,damienalexandre/symfony,ogizanagi/symfony,1ed/symfony,gonzalovilaseca/symfony,docteurklein/symfony,fabpot/symfony,HeahDude/symfony,sgehrig/symfony,lstrojny/symfony,tgalopin/symfony,MatTheCat/symfony,garak/symfony,curry684/symfony,nicolas-grekas/symfony,oleg-andreyev/symfony,hhamon/symfony,romaricdrigon/symfony,pierredup/symfony,fabpot/symfony,d-ph/symfony,symfony/symfony,Koc/symfony,Tobion/symfony,shieldo/symfony,maidmaid/symfony,ro0NL/symfony,derrabus/symfony,kbond/symfony,kbond/symfony,curry684/symfony,smatyas/symfony,tgalopin/symfony,nicolas-grekas/symfony,lyrixx/symfony,garak/symfony,romaricdrigon/symfony,dmaicher/symfony,pyrech/symfony,jvasseur/symfony,voronkovich/symfony,tgalopin/symfony,alekitto/symfony,docteurklein/symfony,Nyholm/symfony,ragboyjr/symfony,localheinz/symfony,damienalexandre/symfony,oleg-andreyev/symfony,jderusse/symfony,voronkovich/symfony,tucksaun/symfony,ogizanagi/symfony,xabbuh/symfony,jakzal/symfony,ragboyjr/symfony,lyrixx/symfony,pierredup/symfony,localheinz/symfony,stof/symfony,Taluu/symfony,mweimerskirch/symfony,zorn-v/symfony,lstrojny/symfony,1ed/symfony,Koc/symfony,mnapoli/symfony,tucksaun/symfony,Nyholm/symfony,jvasseur/symfony,localheinz/symfony,mnapoli/symfony,MatTheCat/symfony,Slamdunk/symfony,smatyas/symfony,MatTheCat/symfony,OskarStark/symfony,tgalopin/symfony,curry684/symfony,HeahDude/symfony,chalasr/symfony,Deamon/symfony,jderusse/symfony,ro0NL/symfony,1ed/symfony,voronkovich/symfony,zorn-v/symfony,alekitto/symfony,ragboyjr/symfony,mpdude/symfony,xabbuh/symfony,damienalexandre/symfony,Simperfit/symfony,shieldo/symfony,Simperfit/symfony,stof/symfony,Tobion/symfony,derrabus/symfony,Koc/symfony,Deamon/symfony,smatyas/symfony,Slamdunk/symfony,pyrech/symfony,bendavies/symfony,jvasseur/symfony,tucksaun/symfony,ro0NL/symfony,bendavies/symfony,Simperfit/symfony,paradajozsef/symfony,ogizanagi/symfony,mnapoli/symfony,gonzalovilaseca/symfony,kbond/symfony,symfony/symfony,Slamdunk/symfony,zcodes/symfony,garak/symfony,symfony/symfony,phramz/symfony,Simperfit/symfony,garak/symfony,ro0NL/symfony,pierredup/symfony,OskarStark/symfony,symfony/symfony,alekitto/symfony,maidmaid/symfony,pyrech/symfony,Tobion/symfony,shieldo/symfony,zerkms/symfony,jderusse/symfony,smatyas/symfony,localheinz/symfony,curry684/symfony,oleg-andreyev/symfony,HeahDude/symfony,tucksaun/symfony,OskarStark/symfony,mweimerskirch/symfony,dmaicher/symfony,oleg-andreyev/symfony,zcodes/symfony,paradajozsef/symfony,stof/symfony,mweimerskirch/symfony,mweimerskirch/symfony,zerkms/symfony,zcodes/symfony,docteurklein/symfony,paradajozsef/symfony,xabbuh/symfony,bendavies/symfony,voronkovich/symfony,Tobion/symfony,pierredup/symfony,gonzalovilaseca/symfony,OskarStark/symfony,Nyholm/symfony,dmaicher/symfony,fabpot/symfony,hhamon/symfony,Koc/symfony,mnapoli/symfony,shieldo/symfony,dmaicher/symfony,stof/symfony,zcodes/symfony,jderusse/symfony,smatyas/symfony,Simperfit/symfony,pyrech/symfony,Deamon/symfony,mpdude/symfony,hhamon/symfony,1ed/symfony,sgehrig/symfony,Slamdunk/symfony,d-ph/symfony,mweimerskirch/symfony,phramz/symfony,zerkms/symfony,Taluu/symfony,Taluu/symfony,romaricdrigon/symfony,alekitto/symfony