Bump python-pppd from 1.0.3 to 1.0.4 (#83)

Bumps [python-pppd](https://github.com/cour4g3/python-pppd) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/cour4g3/python-pppd/releases)
- [Commits](COUR4G3/python-pppd@v1.0.3...1.0.4)

---
updated-dependencies:
- dependency-name: python-pppd
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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requirements.txt

@@ -1,6 +1,6 @@
 pyroute2==0.5.*
 pyserial~=3.5
-python-pppd==1.0.3
+python-pppd==1.0.4
 python-sdk-auth~=0.3.0
 pyudev~=0.22.0
 pyusb~=1.2.1