Raise minimum supported compiler version to 1.34

dtolnay · dtolnay · commit 2a67f94ad7c3 · 2019-09-18T18:47:28.000-07:00
Required by use of TryFrom in simd-json.
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ rust:
   - stable
   - beta
   - nightly
-  - 1.33.0
+  - 1.34.0
 
 script:
   - cargo check

-Original file line number
+Diff line change
   - stable
   - beta
   - nightly
 -  - 1.33.0
 +  - 1.34.0
 script:
   - cargo check