Update minimum nightly to 1.37 07-12

.travis.yml

@@ -21,7 +21,7 @@ matrix:
     - name: Minimum nightly
       python: "3.7"
       # Keep this synced up with build.rs
-      env: TRAVIS_RUST_VERSION=nightly-2019-06-22
+      env: TRAVIS_RUST_VERSION=nightly-2019-07-12
       # Tested via anaconda PyPy (since travis's PyPy version is too old)
     - name: PyPy3.5 7.0
       python: "3.7"

README.md

@@ -16,7 +16,7 @@ A comparison with rust-cpython can be found [in the guide](https://pyo3.rs/maste
 
 ## Usage
 
-PyO3 supports Python 3.5 and up. The minimum required Rust version is 1.34.0-nightly 2019-02-06.
+PyO3 supports Python 3.5 and up. The minimum required Rust version is 1.37.0-nightly 2019-07-12.
 
 PyPy is also supported (via cpyext) for Python 3.5 only, targeted PyPy version is 7.0.0.
 Please refer to the guide for installation instruction against PyPy.

build.rs

@@ -16,7 +16,7 @@ use version_check::{Channel, Date, Version};
 /// Specifies the minimum nightly version needed to compile pyo3.
 /// Keep this synced up with the travis ci config,
 /// But note that this is the rustc version which can be lower than the nightly version
-const MIN_DATE: &'static str = "2019-06-21";
+const MIN_DATE: &'static str = "2019-07-11";
 const MIN_VERSION: &'static str = "1.37.0-nightly";
 
 /// Information returned from python interpreter

guide/src/get_started.md

@@ -10,7 +10,7 @@ A comparison with rust-cpython can be found [in the guide](https://pyo3.rs/maste
 
 ## Usage
 
-PyO3 supports Python 3.5 and up. The minimum required Rust version is 1.34.0-nightly 2019-02-06.
+PyO3 supports Python 3.5 and up. The minimum required Rust version is 1.37.0-nightly 2019-07-12.
 
 PyPy is also supported (via cpyext) for Python 3.5 only, targeted PyPy version is 7.0.0.
 Please refer to the guide for installation instruction against PyPy.