Add route /school/years

src/libs/routes/school.js

@@ -25,6 +25,12 @@ schoolApp.get('/year_range', (req, res, next) => {
     next();
 }, query, response('range'));
 
+schoolApp.get('/years', (req, res, next) => {
+    req.sql.from('escola').
+    field('DISTINCT escola.ano_censo', 'years');
+    next();
+}, query, response('years'));
+
 schoolApp.get('/location', (req, res, next) => {
     req.result = [
         {id: 1, name: 'Urbana'},