rust: lock major versions of crates

rust/Cargo.toml.in

@@ -16,21 +16,20 @@ strict = []
 debug = []
 
 [dependencies]
-nom = "4.2"
-bitflags = "1.0"
+nom = "~4.2.3"
+bitflags = "~1.0.4"
 byteorder = "~1.3.4"
-crc = "1.8"
-memchr = "2.2"
-num = "0.2"
-num-derive = "0.2"
-num-traits = "0.2"
-widestring = "0.4"
+crc = "~1.8.1"
+memchr = "~2.2.1"
+num = "~0.2.1"
+num-derive = "~0.2.5"
+num-traits = "~0.2.14"
+widestring = "~0.4.3"
 
-der-parser = "1.1"
-kerberos-parser = "0.2"
-
-ntp-parser = "0.3"
-ipsec-parser = "0.4"
-snmp-parser = "0.3.0"
-tls-parser = "0.8"
-x509-parser = "0.4"
+der-parser = "~1.1.1"
+kerberos-parser = "~0.2.0"
+ntp-parser = "~0.3.0"
+ipsec-parser = "~0.4.1"
+snmp-parser = "~0.3.0"
+tls-parser = "~0.8.1"
+x509-parser = "~0.4.3"