Make it work with the latest ndarray

Author: kngwyu

Cargo.toml

@@ -14,7 +14,7 @@ cfg-if = "0.1"
 libc = "0.2"
 num-complex = "0.2"
 num-traits = "0.2"
-ndarray = "0.12"
+ndarray = ">=0.12"
 pyo3 = "0.8"
 
 [features]

src/array.rs

@@ -414,7 +414,7 @@ impl<T: TypeNum, D: Dimension> PyArray<T, D> {
     /// # #[macro_use] extern crate ndarray; fn main() {
     /// use numpy::PyArray2;
     /// let gil = pyo3::Python::acquire_gil();
-    /// let pyarray = PyArray2::zeros(gil.python(), [2, 2], false);
+    /// let pyarray: &PyArray2<usize> = PyArray2::zeros(gil.python(), [2, 2], false);
     /// assert_eq!(pyarray.as_array(), array![[0, 0], [0, 0]]);
     /// # }
     /// ```