Suggest installing with pip

The Python Packaging User Guide recommends installing packages with pip.
See https://packaging.python.org/en/latest/installing.html#use-pip-for-installing
diff --git a/README.md b/README.md
index b0d6a8c..117681d 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 Install:
 
-    easy_install pytoml
+    pip install pytoml
 
 The interface is the same as for the standard `json` package.