Ensure that encoded output ends with a newline

src/encode.rs

@@ -62,6 +62,11 @@ impl<R: Read, W: Write> Encoder<R, W> {
                 break;
             }
             if n_bytes == 0 {
+                if let Some(wrap) = self.wrap {
+                    if total % wrap != 0 {
+                        writeln!(self.writer)?;
+                    }
+                }
                 break;
             }
             for (idx, n) in ibuf.iter().enumerate() {

testdata/lorem_b64.txt

@@ -38,4 +38,4 @@ IGlwc3VtIHByZXRpdW0gZXUgZmFjaWxpc2lzLiBEdWlzIGxvYm9ydGlzIHByb2luIGZhY2lsaXNp
 IGFkIHN1c2NpcGl0IHZlc3RpYnVsdW0gaGFjIHRvcnRvciBpbnRlcmR1bS4gVWx0cmljZXMgdGlu
 Y2lkdW50IG1heGltdXMgYXB0ZW50IHBoYXNlbGx1cyBpbiB1bGxhbWNvcnBlciBuaXNsIHZhcml1
 cyBkaXMuIFZlbmVuYXRpcyBlbmltIHBvdGVudGkgcG90ZW50aSBzb2RhbGVzIG1hc3NhIGlkIGVs
-ZW1lbnR1bS4K
+ZW1lbnR1bS4K