feat: Add AWS module (#419)

Adds a module for displaying the current AWS profile based 
on the AWS_PROFILE envar.

tests/testsuite/aws.rs

@@ -0,0 +1,25 @@
+use ansi_term::Color;
+use std::io;
+
+use crate::common;
+
+#[test]
+fn no_profile_set() -> io::Result<()> {
+    let output = common::render_module("aws").env_clear().output()?;
+    let expected = "";
+    let actual = String::from_utf8(output.stdout).unwrap();
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
+#[test]
+fn profile_set() -> io::Result<()> {
+    let output = common::render_module("aws")
+        .env_clear()
+        .env("AWS_PROFILE", "astronauts")
+        .output()?;
+    let expected = format!("on {} ", Color::Yellow.bold().paint("☁️ astronauts"));
+    let actual = String::from_utf8(output.stdout).unwrap();
+    assert_eq!(expected, actual);
+    Ok(())
+}

tests/testsuite/main.rs

@@ -1,3 +1,4 @@
+mod aws;
 mod character;
 mod cmd_duration;
 mod common;