README update.

README.md

@@ -58,6 +58,19 @@ to use this library in very early versions of Linspector in 2011. Since the main
 in Linspector is the execution of jobs in regularly intervals I believe it is the right 
 decision to include the code of APScheduler directly into the Linspector project.
 
+### Other used libraries
+
+monitors, notifications, services or plugins sometimes need to make the use of 
+3rd party libraries, but they are not required to run Linspector properly. Not installing 
+them may only affect parts of Linspector. Currently used libraries are:
+
+- [CherryPy](https://cherrypy.dev/) - CherryPy is a pythonic, object-oriented HTTP framework. Used by the HTTPServer plugin.
+- [requests](https://requests.readthedocs.io/en/latest/) - Requests is an elegant and simple HTTP library for Python, built for human beings. Used by the Speedtest service.
+
+These libraries are not being delivered with the Linspector source code and maybe have 
+different and incompatible licenses. You need to install them using pip, your OS package
+manager or any other possible way.
+
 ### Version numbering
 
 According to: [https://wiki.unixpeople.org/linux_kernel_version_numbering](https://wiki.unixpeople.org/linux_kernel_version_numbering)

requirements.txt

@@ -1,2 +1,2 @@
-requests~=2.28.1 # used by speedtest type
+CherryPy~=18.8.0 # used by httpserver plugin
-CherryPy~=18.8.0 # used by httpserver plugin
+requests~=2.28.1 # used by speedtest service