Crash for (really) small terminal sizes

[sharkdp]

If the terminal width is smaller than the size of the side-panel, bat crashes with

fatal runtime error: allocator memory exhausted
[1]    14199 illegal hardware instruction (core dumped)  bat README.md

Running in debug mode reveals the problematic code line:

thread 'main' panicked at 'attempt to subtract with overflow', src/printer.rs:153:32

bat/src/printer.rs

Line 153 in 54b33c8

let hline = "─".repeat(self.config.term_width - (PANEL_WIDTH + 1));