Various improvements

README

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+BORING BACKUP
+
+    Bash powered backuping tool.
+
+INSTALLATION
+
+    Install for user locally:
+        make prefix=$HOME/.local install
+
+    Uninstall:
+        make prefix=$HOME/.local uninstall
+
+DEVELOPMENT
+
+    TESTING
+
+    BB uses amazing test suite: https://bats-core.readthedocs.io/
+
+    Install Bats:
+        git clone https://github.com/bats-core/bats-core.git
+        bash bats-core/install.sh ~/.local
+
+    Add some Bats extensions:
+        git clone https://github.com/bats-core/bats-assert.git tests/helpers/bats-assert
+        git clone https://github.com/bats-core/bats-support.git tests/helpers/bats-support
+
+    Run tests:
+        make test