Add Array::resize_raw. (#32)

This commit adds a new method Array::resize_raw that changes the size
 of the octets sequence inside and array without updating the content.

Author: partim

src/array.rs

@@ -1,3 +1,4 @@
+//! A fixed-capacity octets sequence.
 
 use core::{cmp, fmt};
 use core::ops::RangeBounds;
@@ -31,6 +32,22 @@ impl<const N: usize> Array<N> {
     pub fn as_slice_mut(&mut self) -> &mut [u8] {
         &mut self.octets[..self.len]
     }
+
+    /// Resizes the array in place updating additional octets.
+    ///
+    /// The method only changes the length of the contained octets
+    /// sequence. If `new_len` is greater than the current length, the
+    /// content of the additional octets will be left at whatever they
+    /// were.
+    ///
+    /// # Panics
+    ///
+    /// The method panics if `new_len` is larger than the array size
+    /// `const N`.
+    pub fn resize_raw(&mut self, new_len: usize) {
+        assert!(new_len < N);
+        self.len = new_len
+    }
 }