Rust: Upgrade dependency integer-encoding to 3.0
diff --git a/lib/rs/Cargo.toml b/lib/rs/Cargo.toml
index 505b9a9..7326902 100644
--- a/lib/rs/Cargo.toml
+++ b/lib/rs/Cargo.toml
@@ -14,7 +14,7 @@
 
 [dependencies]
 byteorder = "1.3"
-integer-encoding = ">=1.1.4" # https://issues.apache.org/jira/browse/THRIFT-5131
+integer-encoding = "3.0"
 log = "0.4"
 ordered-float = "1.0"
 threadpool = "1.7"