try colorize the output

Author: mvorisek

appveyor/test_task.bat

@@ -119,7 +119,7 @@ mkdir c:\tests_tmp
 set TEST_PHP_JUNIT=c:\junit.out.xml
 
 cd "%APPVEYOR_BUILD_FOLDER%"
-nmake test TESTS="%OPCACHE_OPTS% -q -g FAIL,XFAIL,BORK,WARN,LEAK,XLEAK,SKIP --offline --show-diff --show-slow 1000 --set-timeout 120 --temp-source c:\tests_tmp --temp-target c:\tests_tmp %PARALLEL%"
+nmake test TESTS="%OPCACHE_OPTS% -q -g FAIL,XFAIL,BORK,WARN,LEAK,XLEAK,SKIP --color --offline --show-diff --show-slow 1000 --set-timeout 120 --temp-source c:\tests_tmp --temp-target c:\tests_tmp %PARALLEL%"
 if %errorlevel% neq 0 exit /b 3
 
 exit /b 0