Revert "Switch to using $HOME instead of ~ in Travis configuration."
Revert "Switch to using $HOME instead of ~ in Travis configuration."

This reverts commit 80880d8e11864dfdd209aa3b7e065f10340cd9c0.

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz