Update README.md

Author: ChRen95

README.md

@@ -15,8 +15,11 @@ The following packages are installed alongside their own dependencies:
 - `pyroll-zouhar-contact`
 - `pyroll-freiberg-flow-stress`
 - `pyroll-lendl-equivalent-method`
-
+- `pyroll-linear-thermal-expansion`
+- `pyroll-elastic-mill-spring`
+- `pyroll-gripping-analysis`
+  
 By importing this package with `import pyroll.basic`, all listed packages are imported and thus registered as active
 plugins.
 The public API of this package is the union of all those packages.
-So with `import pyroll.basic as pr` one has access to all public APIs of those packages under one single alias.
+So with `import pyroll.basic as pr` one has access to all public APIs of those packages under one single alias.