Bump github.com/creack/pty from 1.1.17 to 1.1.18

Bumps [github.com/creack/pty](https://github.com/creack/pty) from 1.1.17 to 1.1.18.
- [Release notes](https://github.com/creack/pty/releases)
- [Commits](https://github.com/creack/pty/compare/v1.1.17...v1.1.18)

---
updated-dependencies:
- dependency-name: github.com/creack/pty
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/go.mod b/go.mod
index 7fc1ece..25f5ec4 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@
 
 go 1.12
 
-require github.com/creack/pty v1.1.17
+require github.com/creack/pty v1.1.18
diff --git a/go.sum b/go.sum
index 52c4817..f32a99d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
-github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
+github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
+github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=