Update mozlog from 3.9 to 3.10
diff --git a/tools/wptrunner/requirements.txt b/tools/wptrunner/requirements.txt
index 1fde996..b220a01 100644
--- a/tools/wptrunner/requirements.txt
+++ b/tools/wptrunner/requirements.txt
@@ -1,5 +1,5 @@
 html5lib == 1.0.1
 mozinfo == 0.10
-mozlog==3.9
+mozlog==3.10
 mozdebug==0.1.1
 urllib3[secure]==1.24.1