Fix travis: skip ev extension installation if PHP version is 5.3.

Author: ivkalita

travis-init.sh

@@ -5,14 +5,12 @@ set -o pipefail
 if [[ "$TRAVIS_PHP_VERSION" != "hhvm" &&
       "$TRAVIS_PHP_VERSION" != "hhvm-nightly" ]]; then
 
-    # install 'event' PHP extension
+    # install 'event' and 'ev' PHP extension
     if [[ "$TRAVIS_PHP_VERSION" != "5.3" ]]; then
         echo "yes" | pecl install event
+        echo "yes" | pecl install ev
     fi
 
-    # install 'ev' PHP extension
-    echo "yes" | pecl install ev
-
     # install 'libevent' PHP extension (does not support php 7)
     if [[ "$TRAVIS_PHP_VERSION" != "7.0" &&
           "$TRAVIS_PHP_VERSION" != "7.1" &&