style: use crlf instead of lf in logo

In some systems, cr is used to indicate a line break.
Better generality can be obtained by using crlf.

src/logo.txt

@@ -1,6 +1,6 @@
-.______       __    __      _______.___________.  _______..______   __
-|   _  \     |  |  |  |    /       |           | /       ||   _  \ |  |
-|  |_)  |    |  |  |  |   |   (----`---|  |----`|   (----`|  |_)  ||  |
-|      /     |  |  |  |    \   \       |  |      \   \    |   _  < |  |
-|  |\  \----.|  `--'  |.----)   |      |  |  .----)   |   |  |_)  ||  |
-| _| `._____| \______/ |_______/       |__|  |_______/    |______/ |__|
+.______       __    __      _______.___________.  _______..______   __
+|   _  \     |  |  |  |    /       |           | /       ||   _  \ |  |
+|  |_)  |    |  |  |  |   |   (----`---|  |----`|   (----`|  |_)  ||  |
+|      /     |  |  |  |    \   \       |  |      \   \    |   _  < |  |
+|  |\  \----.|  `--'  |.----)   |      |  |  .----)   |   |  |_)  ||  |
+| _| `._____| \______/ |_______/       |__|  |_______/    |______/ |__|