Update README.md

`chmod +x` gets the same result that `chmod a+x` and `chmod uga+x`.

Classes of users are used to distinguish to whom the permissions apply. If no classes are specified "all" is implied. The classes are represented by one or more of the following letters:

Reference	Class	Description
u	user	file owner
g	group	members of the file's group
o	others	users who are neither the file's owner nor members of the file's group
a	all	all three of the above, same as ugo
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Krot Eval 2020-11-05 13:43:10 +03:00 committed by GitHub
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@ -24,7 +24,7 @@ FROM php:7.2-cli
ADD https://raw.githubusercontent.com/mlocati/docker-php-extension-installer/master/install-php-extensions /usr/local/bin/
RUN chmod uga+x /usr/local/bin/install-php-extensions && sync && \
RUN chmod +x /usr/local/bin/install-php-extensions && sync && \
install-php-extensions gd xdebug
```