Fix inconsistent formatting (#5567)

README.md

@@ -444,7 +444,7 @@ _Libraries for building standard or basic Command Line applications._
 - [mow.cli](https://github.com/jawher/mow.cli) - Go library for building CLI applications with sophisticated flag and argument parsing and validation.
 - [ops](https://github.com/nanovms/ops) - Unikernel Builder/Orchestrator.
 - [pflag](https://github.com/spf13/pflag) - Drop-in replacement for Go's flag package, implementing POSIX/GNU-style --flags.
-- [readline](https://github.com/reeflective/readline) Shell library with modern and easy to use UI features.
+- [readline](https://github.com/reeflective/readline) - Shell library with modern and easy to use UI features.
 - [sand](https://github.com/Zaba505/sand) - Simple API for creating interpreters and so much more.
 - [sflags](https://github.com/octago/sflags) - Struct based flags generator for flag, urfave/cli, pflag, cobra, kingpin, and other libraries.
 - [strumt](https://github.com/antham/strumt) - Library to create prompt chain.