Download pyo3-pack instead of installing.

Author: sebpuetz

.travis.yml

@@ -37,19 +37,28 @@ install:
       source venv/bin/activate
       pip install cffi virtualenv pytest numpy
     fi
-  - cargo install --git https://github.com/PyO3/pyo3-pack.git --tag v0.6.1 pyo3-pack
   - rustup default nightly-2019-07-19
   - rustup component add rustfmt
   - rustup component add clippy
+  - |
+    if [ "$TRAVIS_OS_NAME" == "osx" ]; then
+      travis_retry wget https://github.com/PyO3/maturin/releases/download/v0.7.2/maturin-v0.7.2-x86_64-apple-darwin.tar.gz
+      tar -xzf maturin-v0.7.2-x86_64-apple-darwin.tar.gz
+    fi
+  - |
+    if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+      travis_retry wget https://github.com/PyO3/maturin/releases/download/v0.7.2/maturin-v0.7.2-x86_64-unknown-linux-musl.tar.gz
+      tar -xzf maturin-v0.7.2-x86_64-unknown-linux-musl.tar.gz
+    fi
 
 script:
   - cargo fmt --all -- --check
   - cargo clippy -- -D warnings
-  - pyo3-pack develop
+  - ./maturin develop
   - pytest
   - |
     if [ -n "$TRAVIS_TAG" ]; then
-      pyo3-pack build --release
+      ./maturin build --release
     fi
 deploy:
   provider: releases