fix eslint errors

src/components/App.js

@@ -30,8 +30,8 @@ const PrivateRoute = ({ component, ...rest }) => {
 };
 
 PrivateRoute.propTypes = {
-  component: PropTypes.node.isRequired,
-  location: PropTypes.string
+  component: PropTypes.func.isRequired,
+  location: PropTypes.object
 };
 
 const PublicRoute = ({ component, ...rest }) => {
@@ -55,7 +55,7 @@ const PublicRoute = ({ component, ...rest }) => {
 };
 
 PublicRoute.propTypes = {
-  component: PropTypes.node.isRequired
+  component: PropTypes.func.isRequired
 };
 
 const App = () => {

src/features/machines/components/Machine.js

@@ -48,7 +48,7 @@ ActionButton.propTypes = {
   action: PropTypes.shape({
     code: PropTypes.string.isRequired,
     tooltip: PropTypes.string.isRequired,
-    system: PropTypes.bool.isRequired,
+    system: PropTypes.bool,
     effect: PropTypes.func.isRequired
   }).isRequired
 };