Update readme with shell aliases information

README.md

@@ -72,9 +72,12 @@ nostromo init
 ### Managing Aliases
 Aliases to commands is one of the core functionalities provided by nostromo. Instead of constantly updating shell profiles manually, nostromo will automatically keep it updated with the latest additions.
 
-**Notes**
-- *Commands are executed in a child process, so aliases cannot modify the parent shell at this time.*
-- *Commands won't take effect until you open a new shell or `source` your `.bashrc` / `.zshrc` again.*
+> Given that nostromo is not a shell command there are some key things to note:
+>
+> - *Commands are executed in a child process, so nostromo aliases cannot modify the parent shell at this time.*
+> - *Commands won't take effect until you open a new shell or `source` your `.bashrc` / `.zshrc` again.*
+>
+> If you want create pure **shell aliases** only you can do that with an additional flag or a config setting described below.
 
 To add an alias (or command in nostromo parlance), simply run:
 ```sh
@@ -99,6 +102,36 @@ where the last one will execute the `echo` command.
 
 This is also how you can compose further commands by adding a **final** command to `foo.bar` for example that will get prepended for commands below that scope.
 
+#### Shell Aliases
+
+nostromo allows users to manage shell aliases. By default, however, all commands are designed to run through the nostromo binary. This allows you to run those declarative commands easily like `foo bar baz`. nostromo only creates an alias for the root command `foo` and passes the remaining arguments to `nostromo run` to evaluate the command tree and execute. Pure shell aliases do not get this behavior.
+
+> The use of pure shell aliases is to persist commands like `cd /path` in the current shell, which nostromo commands cannot do since it runs in a child process.
+
+There are two methods for adding aliases to your shell profile that are considered regular or pure aliases:
+- Use the `--alias-only` or `-a` flag when using `nostromo add cmd`
+- Set the `aliasesOnly` config setting to affect all command additions
+
+For creating all commands as shell aliases, there is a convenient config setting named `aliasesOnly` that can be set. All subsequent add commands will result in aliases for only that command running in the current shell.
+```sh
+nostromo manifest set aliasesOnly true
+```
+
+For example:
+```sh
+nostromo add cmd foo.bar.baz "cd /tmp"
+```
+will result in this line in your profile:
+```sh
+alias foo.bar.baz='cd /tmp'
+```
+instead of the standard nostromo command:
+```sh
+alias foo='nostromo run foo "$*"'
+```
+
+Notice how the keypath has no affect in building a command tree when using the **alias only** feature. Currently, pure shell aliases can only be root level commands.
+
 ### Scoped Commands & Substitutions
 Scope affects a tree of commands such that a parent scope is prepended first and then each command in the keypath. If a command is run as follows:
 ```sh

go.mod

@@ -3,7 +3,6 @@ module github.com/pokanop/nostromo
 go 1.12
 
 require (
-	github.com/kr/pretty v0.1.0
 	github.com/logrusorgru/aurora v0.0.0-20190417123914-21d75270181e
 	github.com/magiconair/properties v1.8.1 // indirect
 	github.com/mattn/go-runewidth v0.0.4 // indirect