v0.2.0

This version adds --[not-]update and --[not-]size options that check for file modification times and file sizes. The positive versions (--update, -u, --size, -s) check for any change to the target values. The negations (--not-update, -U, --not-size, -S) check for any two consecutive values that are identical.

These may be useful in waiting for a download to complete (waitfor -S ./Downloads/install-disc.iso); your Rust binary to finish compiling (waitfor -u ./target/release/waitfor), etc.