Fix broken link (README.md), fix typo

lib/install.js

@@ -53,7 +53,7 @@ async function install() {
     // return the full path to our Hugo binary
     return installedToPath;
   } catch (error) {
-    // pass whatever error occured along the way to console
+    // pass whatever error occurred along the way to console
     console.error(`${logSymbols.error} Hugo installation failed. :(`);
     throw error;
   }