Bump nightly version

Author: sgrif

.travis.yml

@@ -4,7 +4,7 @@ dist: trusty
 rust:
   - stable
   - beta
-  - nightly-2016-03-20
+  - nightly-2016-04-01
   - nightly
 addons:
   postgresql: '9.4'

diesel_compile_tests/tests/compile-fail/pg_specific_expressions_cant_be_used_in_a_sqlite_query.rs

@@ -22,7 +22,7 @@ fn main() {
 
     users.select(id).filter(name.eq(any(Vec::<String>::new())))
         .load::<i32>(&connection);
-    //~^ ERROR type mismatch resolving `<diesel::sqlite::connection::SqliteConnection as diesel::connection::Connection>::Backend == diesel::pg::backend::Pg
+    //~^ ERROR type mismatch resolving `<diesel::sqlite::SqliteConnection as diesel::Connection>::Backend == diesel::pg::Pg`
     users.select(id).filter(name.is_not_distinct_from("Sean"))
         .load::<i32>(&connection);
     //~^ ERROR E0277

diesel_compile_tests/tests/compile-fail/select_carries_correct_result_type_info.rs

@@ -19,7 +19,7 @@ fn main() {
     let select_name = users.select(name);
 
     let ids = select_name.load::<i32>(&connection);
-    //~^ ERROR the trait `diesel::query_source::Queryable<diesel::types::VarChar, _>` is not implemented for the type `i32`
+    //~^ ERROR the trait `diesel::Queryable<diesel::types::VarChar, _>` is not implemented for the type `i32`
     let names = select_id.load::<String>(&connection);
-    //~^ ERROR the trait `diesel::query_source::Queryable<diesel::types::Integer, _>` is not implemented
+    //~^ ERROR the trait `diesel::Queryable<diesel::types::Integer, _>` is not implemented
 }