Fix 'pip install' error on travis (#49)
Fix 'pip install' error on travis (#49)

Permission denined error occurred when installing the pip packages.
To fix error, add user option to the pip install.

Signed-off-by: Hunseop Jeong <244c730fbe22cc3e4d6e6ea787421cbcaa34aea6@samsung.com>
Kwanghyuk-Kim/WATT,HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT,Jw00/WATT,HunseopJeong/WATT,HunseopJeong/WATT,ws29jung/WATT,Kwanghyuk-Kim/WATT,ws29jung/WATT,Jw00/WATT,Jw00/WATT,ws29jung/WATT,HunseopJeong/WATT,Kwanghyuk-Kim/WATT,ws29jung/WATT,Jw00/WATT,Kwanghyuk-Kim/WATT