Fix README for ndarray 0.13, ndarray-linalg 0.12

Author: termoshtt

README.md

@@ -38,8 +38,8 @@ There are three features corresponding to the backend implementations (`openblas
 
 ```toml
 [dependencies]
-ndarray = "0.12"
-ndarray-linalg = { version = "0.11", features = ["openblas"] }
+ndarray = "0.13"
+ndarray-linalg = { version = "0.12", features = ["openblas"] }
 ```
 
 ### Tested Environments
@@ -55,8 +55,8 @@ If you creating a library depending on this crate, we encourage you not to link
 
 ```toml
 [dependencies]
-ndarray = "0.12"
-ndarray-linalg = "0.11"
+ndarray = "0.13"
+ndarray-linalg = "0.12"
 ```
 
 ### Link backend crate manually
@@ -65,8 +65,8 @@ You should link a LAPACKE implementation to a final crate (like binary executabl
 
 ```toml
 [dependencies]
-ndarray = "0.12"
-ndarray-linalg = "0.11"
+ndarray = "0.13"
+ndarray-linalg = "0.12"
 openblas-src = "0.7" # or another backend of your choice
 
 ```