Update package.yaml

Unsure about `version`.

Author: quintuple-mallard

exercises/practice/square-root/package.yaml

@@ -0,0 +1,21 @@
+name: square-root
+version: 2.3.0.10
+
+dependencies:
+  - base
+
+library:
+  exposed-modules: SquareRoot
+  source-dirs: src
+  ghc-options: -Wall
+  # dependencies:
+  # - foo       # List here the packages you
+  # - bar       # want to use in your solution.
+
+tests:
+  test:
+    main: Tests.hs
+    source-dirs: test
+    dependencies:
+      - square-root
+      - hspec