Replace PHP 7.0 by PHP 7.3

.travis.yml

@@ -5,15 +5,15 @@ env:
   - VARIANT=php5.6/apache
   - VARIANT=php5.6/fpm
   - VARIANT=php5.6/fpm-alpine
-  - VARIANT=php7.0/apache
-  - VARIANT=php7.0/fpm
-  - VARIANT=php7.0/fpm-alpine
   - VARIANT=php7.1/apache
   - VARIANT=php7.1/fpm
   - VARIANT=php7.1/fpm-alpine
   - VARIANT=php7.2/apache
   - VARIANT=php7.2/fpm
   - VARIANT=php7.2/fpm-alpine
+  - VARIANT=php7.3/apache
+  - VARIANT=php7.3/fpm
+  - VARIANT=php7.3/fpm-alpine
 
 install:
   - git clone https://github.com/docker-library/official-images.git ~/official-images

php7.3/apache/Dockerfile

@@ -1,4 +1,4 @@
-FROM php:7.0-apache
+FROM php:7.3-apache
 LABEL maintainer="Michael Babker <michael.babker@joomla.org> (@mbabker)"
 
 # Disable remote database security requirements.

php7.3/fpm-alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM php:7.0-fpm-alpine
+FROM php:7.3-fpm-alpine
 LABEL maintainer="Michael Babker <michael.babker@joomla.org> (@mbabker)"
 
 # Disable remote database security requirements.

php7.3/fpm/Dockerfile

@@ -1,4 +1,4 @@
-FROM php:7.0-fpm
+FROM php:7.3-fpm
 LABEL maintainer="Michael Babker <michael.babker@joomla.org> (@mbabker)"
 
 # Disable remote database security requirements.