Use portable equality test

resources/scripts/cmd-proxy.sh

@@ -11,7 +11,7 @@ architecture="${ARCH:-${TRAVIS_CPU_ARCH:-$(uname -m)}}"
 
 cmd_proxy=""
 
-if [ "${architecture}" == "arm32" ]; then
+if [ "${architecture}" = "arm32" ]; then
     image="benramsey/ramsey-uuid:php-${php_version}-arm32v7"
     volumes="-v ${PWD}:/app -v ${HOME}/.composer:/root/.composer"
     cmd_proxy="docker run -it --rm ${volumes} -w /app ${image}"

resources/scripts/system-info.sh

@@ -3,7 +3,7 @@
 endianness=$(printf I | hexdump -o | awk '{ print substr($2,6,1); exit}')
 
 endian="Big"
-if [ "${endianness}" == "1" ]; then
+if [ "${endianness}" = "1" ]; then
     endian="Little"
 fi
 

resources/scripts/travis-before-install.sh

@@ -6,7 +6,7 @@
 
 architecture=${ARCH:-${TRAVIS_CPU_ARCH:-$(uname -m)}}
 
-if [ "${architecture}" == "arm32" ]; then
+if [ "${architecture}" = "arm32" ]; then
     exit
 fi