Drop --isolated from pip arguments (#17)

Author: Secrus

.gitignore

@@ -371,3 +371,4 @@ dmypy.json
 
 # Cython debug symbols
 cython_debug/
+.idea

install-poetry.py

@@ -346,7 +346,7 @@ def python(self, *args, **kwargs) -> subprocess.CompletedProcess:
         return self.run(self._python, *args, **kwargs)
 
     def pip(self, *args, **kwargs) -> subprocess.CompletedProcess:
-        return self.python("-m", "pip", "--isolated", *args, **kwargs)
+        return self.python("-m", "pip", *args, **kwargs)
 
 
 class Cursor: