refactor(docs): Improve examples in README and CLI

[sergiotejon]

CLI Example:

Increment the version of the project according to the conventional commits specification.

Usage:
  gommitizen bump [flags]

Examples:
# To bump the version of a project, run:
gommitizen bump
# This will bump the version of all projects in the current directory.
# If you want to bump the version of a specific project, run:
gommitizen bump -d <directory>
# This will bump the version of the project in the given directory.
# If you want to bump the version of projects and generate a changelog, run:
gommitizen bump -c
# This will bump the version of the projects and generate a changelog with the changes made since the last version.
# If you want to bump the version of project to a major version, run:
gommitizen bump -i major


Flags:
  -c, --changelog          generate the changelog for the newest version
  -h, --help               help for bump
  -i, --increment string   manually specify the desired increment {MAYOR, MINOR, PATCH}

Global Flags:
      --debug              Enable debug
  -d, --directory string   Select a directory to run the command

README example:

Examples of usage:

# To bump the version of a project, run:
gommitizen bump
# This will bump the version of all projects in the current directory.

# If you want to bump the version of a specific project, run:
gommitizen bump -d <directory>
# This will bump the version of the project in the given directory.

# If you want to bump the version of projects and generate a changelog, run:
gommitizen bump -c
# This will bump the version of the projects and generate a changelog with the changes made since the last version.

# If you want to bump the version of project to a major version, run:
gommitizen bump -i major

[sergiotejon]

Acabo de ver un cagada de un perfecto castellano:

  -i, --increment string   manually specify the desired increment {---> MAYOR <----, MINOR, PATCH}