Issue with ndarray 0.15 fixed (see #91) so relax version restriction

Author: nbigaouette

onnxruntime/Cargo.toml

@@ -22,8 +22,7 @@ required-features = ["model-fetching"]
 onnxruntime-sys = { version = "0.0.14", path = "../onnxruntime-sys" }
 
 lazy_static = "1.4"
-# FIXME: ndarray >=0.15.2 breaks the build
-ndarray = ">=0.15.0,<0.15.2"
+ndarray = "0.15"
 thiserror = "1.0"
 tracing = "0.1"