use much better hack to remove CRLF from body

src/main.zig

@@ -243,7 +243,9 @@ const Multipart = struct {
         // read body until we find the boundary end marker (--{s} OR --{s}--)
         var it = std.mem.split(remaining_body, self.boundary);
         const almost_actual_body = it.next() orelse return error.MissingPartBody;
-        const body = std.mem.trimRight(u8, almost_actual_body, "\r\n");
+
+        var body_it = std.mem.split(almost_actual_body, "\r\n");
+        const body = body_it.next().?;
 
         const next_boundary_pos = self.stream.pos + body.len;
         const next_boundary_body = self.stream.buffer[next_boundary_pos..self.stream.buffer.len];