Bump github.com/mattn/go-runewidth from 0.0.13 to 0.0.15

Bumps [github.com/mattn/go-runewidth](https://github.com/mattn/go-runewidth) from 0.0.13 to 0.0.15.
- [Commits](mattn/go-runewidth@v0.0.13...v0.0.15)

---
updated-dependencies:
- dependency-name: github.com/mattn/go-runewidth
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -3,7 +3,7 @@ module github.com/Code-Hex/Neo-cowsay/v2
 require (
 	github.com/Code-Hex/go-wordwrap v1.0.0
 	github.com/google/go-cmp v0.5.6
-	github.com/mattn/go-runewidth v0.0.13
+	github.com/mattn/go-runewidth v0.0.15
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )
 

go.sum

@@ -3,8 +3,8 @@ github.com/Code-Hex/go-wordwrap v1.0.0/go.mod h1:/SsbgkY2Q0aPQRyvXcyQwWYTQOIwSOR
 github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
-github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=