Add instructions for installing prerelease

BartoszCki · dandruszak · commit 5c3bee0f3090 · 2019-03-29T10:25:47.000+01:00
diff --git a/README.md b/README.md
@@ -14,6 +14,10 @@ Getting Started
 
     `pip install -U paperspace`
 
+    To install/update prerelease (Alpha/Beta) version version of paperspace-python, use:
+
+    `pip install -U --pre paperspace`
+
 3. Download your api key by executing the following:
 
     `paperspace-python login`
