Add version information to all deprecations and update a FIXME comment with a conrete version.

Author: adamreichold

src/array.rs

@@ -1040,6 +1040,7 @@ impl<T: Element> PyArray<T, Ix1> {
     /// });
     /// ```
     #[deprecated(
+        since = "0.17.0",
         note = "`from_exact_iter` is deprecated as it does not provide any benefit over `from_iter`."
     )]
     #[inline(always)]

src/borrow.rs

@@ -739,7 +739,7 @@ fn gcd_strides(strides: &[isize]) -> isize {
     reduce(strides.iter().copied(), gcd).unwrap_or(1)
 }
 
-// FIXME(adamreichold): Use `usize::abs_diff` from std when that becomes stable.
+// FIXME(adamreichold): Use `usize::abs_diff` from std when our MSRV reaches 1.60.
 fn abs_diff(lhs: usize, rhs: usize) -> usize {
     if lhs >= rhs {
         lhs - rhs

src/dtype.rs

@@ -146,7 +146,10 @@ impl PyArrayDescr {
     }
 
     #[doc(hidden)]
-    #[deprecated(note = "`get_type()` is deprecated, please use `typeobj()` instead")]
+    #[deprecated(
+        since = "0.16.0",
+        note = "`get_type()` is deprecated, please use `typeobj()` instead"
+    )]
     pub fn get_type(&self) -> &PyType {
         self.typeobj()
     }

src/npyiter.rs

@@ -14,6 +14,7 @@
 //!
 //! [iterator]: https://numpy.org/doc/stable/reference/c-api/iterator.html
 #![deprecated(
+    since = "0.16.0",
     note = "The wrappers of the array iterator API are deprecated, please use ndarray's iterators like `Lanes` and `Zip` instead."
 )]
 #![allow(missing_debug_implementations)]