force pip upgrades

src/travis/linux-x86_64-before-install.sh

@@ -114,7 +114,6 @@ else
 fi
 
 echo "Upgrading pip packages..."
-$pip freeze > upgrades.txt
+$pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U
-$pip install --upgrade -r upgrades.txt
 $pip install --upgrade -r src/requirements.txt
 $pip install --upgrade pyinstaller

src/travis/osx-x86_64-before-install.sh

@@ -65,7 +65,6 @@ cd $whereibelong
 
 export PATH=/usr/local/opt/python/libexec/bin:$PATH
 $pip install --upgrade pip
-$pip freeze > upgrades.txt
+$pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U
-$pip install --upgrade -r upgrades.txt
 $pip install --upgrade -r src/requirements.txt
 $pip install --upgrade pyinstaller

src/travis/windows-x86-before-install.sh

@@ -21,8 +21,7 @@ until cinst -y wixtoolset; do echo "trying again..."; done
 export PATH=$PATH:/c/Python37/scripts
 cd $mypath
 pip install --upgrade pip
-pip freeze > upgrades.txt
+pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U
-pip install --upgrade -r upgrades.txt
 pip install --upgrade -r src/requirements.txt
 
 #pip install --upgrade pyinstaller

src/travis/windows-x86_64-before-install.sh

@@ -21,8 +21,7 @@ until cinst -y wixtoolset; do echo "trying again..."; done
 export PATH=$PATH:/c/Python37/scripts
 cd $mypath
 pip install --upgrade pip
-pip freeze > upgrades.txt
+pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U
-pip install --upgrade -r upgrades.txt
 pip install --upgrade -r src/requirements.txt
 #pip install --upgrade pyinstaller
 # Install PyInstaller from source and build bootloader