Document that the memory increases appear to be necessary for Travis only (and that they do appear to solve the problem there).
RELNOTES=n/a
<mode>htmlunit</mode>
<htmlunit>FF38</htmlunit>
<productionMode>true</productionMode>
- <!-- Attempt to fix OutOfMemoryError in Travis. -->
+ <!-- Fix OutOfMemoryError in Travis. -->
<extraJvmArgs>-Xms3500m -Xmx3500m -Xss1024k</extraJvmArgs>
<sourceLevel>auto</sourceLevel>
<userAgents>gecko1_8</userAgents>
