Fallback to default year if -r flag used in directory without git repo.

README.md

@@ -38,6 +38,7 @@ npm install --global @captainsafia/legit
     -y --year [year]  The year the license is in effect. 
     -r --range        Year range from first commit year to current year. 
                       Takes precedence over -y/--year.
+                      Will fall back to default year if git repo is not found in current directory.
 ```
 
 ![Legit Demo](https://cloud.githubusercontent.com/assets/1857993/23821404/bea5dfc2-05f6-11e7-8525-7f5bd88a7829.gif)

src/index.js

@@ -43,12 +43,16 @@ program
     var   yearArg = this.year || new Date().getFullYear();
 
     if (this.range) {
-      var firstCommitYear = firstCommitDate.sync(cwd + '/.git').getFullYear();
-      var currentYear = new Date().getFullYear();
-      if (currentYear === firstCommitYear) {
-        yearArg = currentYear;
-      } else {
-        yearArg = firstCommitYear + "-" + currentYear;
+      try {
+        var firstCommitYear = firstCommitDate.sync(cwd + '/.git').getFullYear();
+        var currentYear = new Date().getFullYear();
+        if (currentYear === firstCommitYear) {
+          yearArg = currentYear;
+        } else {
+          yearArg = firstCommitYear + "-" + currentYear;
+        }
+      } catch (error) {
+        console.log('git repository not found in this directory. Using', yearArg, 'as year.');
       }
     }