Enable the usage of Roles rather then AWS Access Key and Secret Key#1

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jarnohenneman wants to merge 6 commits intofuturevision:masterfrom

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Commits on Mar 9, 2018

Make ENV variables optional, so Role on container can be used
Jarno Henneman
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Jarno Henneman
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Commits on Mar 16, 2018

Updated Readme.md with AWS Role.
Jarno Henneman
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Commits on Apr 18, 2018

Updated to alpine:3.7
jarnohenneman
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Update README.md with mentioned of Network Mode to Host
Jarno Henneman
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Merge branch 'master' of github.com:jarnohenneman/aws-s3-sync
Jarno Henneman
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