Update README.rst (#1199)

Fix formatting.

Author: podusowski

README.rst

@@ -65,8 +65,11 @@ your `Cargo.toml`.
   - This crate can be used without the standard library by disabling the
     default `std` feature. To do so, use this in your `Cargo.toml`:
 
-    [dependencies]
-    ndarray = { version = "0.x.y", default-features = false }
+    ::
+      
+      [dependencies]
+      ndarray = { version = "0.x.y", default-features = false }
+    
 
   - The `geomspace` `linspace` `logspace` `range` `std` `var` `var_axis` and `std_axis`
     methods are only available when `std` is enabled.