test.sh: Remove 1.29 pinning

We no longer need to test Rust 1.29, remove the pinning from the test
script.

Author: tcharding

contrib/test.sh

@@ -8,19 +8,6 @@ then
     alias cargo="cargo +$TOOLCHAIN"
 fi
 
-pin_common_verions() {
-    cargo generate-lockfile --verbose
-    cargo update -p cc --precise "1.0.41" --verbose
-    cargo update -p serde --precise "1.0.98" --verbose
-    cargo update -p serde_derive --precise "1.0.98" --verbose
-}
-
-# Pin `cc` for Rust 1.29
-if [ "$PIN_VERSIONS" = true ]; then
-    pin_common_verions
-    cargo update -p byteorder --precise "1.3.4"
-fi
-
 if [ "$DO_COV" = true ]
 then
     export RUSTFLAGS="-C link-dead-code"
@@ -95,10 +82,5 @@ then
     cd dep_test
     echo 'bitcoin = { path = "..", features = ["use-serde"] }' >> Cargo.toml
 
-    # Pin `cc` for Rust 1.29
-    if [ -n "$PIN_VERSIONS" ]; then
-        pin_common_verions
-    fi
-
     cargo test --verbose
 fi