fix current path so we can find requirements.txt on arm

src/travis/linux-arm64-before-install.sh

@@ -61,13 +61,13 @@ pip=~/python/bin/pip3
 
 $python -V
 
+cd $whereibelong
+
 echo "Upgrading pip packages..."
 $pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U
 $pip install --upgrade -r src/requirements.txt
 $pip install --upgrade https://github.com/pyinstaller/pyinstaller/archive/develop.tar.gz
 
-cd $whereibelong
-
 mkdir ~/.ruby
 export GEM_HOME=~/.ruby
 export PATH=$PATH:~/.ruby/bin