Add route /classroom/years

src/libs/routes/classroom.js

@@ -27,6 +27,12 @@ classroomApp.get('/year_range', (req, res, next) => {
     next();
 }, query, response('range'));
 
+classroomApp.get('/years', (req, res, next) => {
+    req.sql.from('escola')
+    .field('DISTINCT escola.ano_censo', 'year');
+    next();
+}, query, response('years'));
+
 classroomApp.get('/adm_dependency', (req, res, next) => {
     req.sql.from('dependencia_adm')
     .field('id')