Bump bazel requirement to 4.0.0.

This is required to build grpcio 1.36.0. Issue #162.
facebookresearch · Mar 30, 2021 · e07926b · e07926b
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diff --git a/.bazelversion b/.bazelversion
@@ -1 +1 @@
-3.1.0
+4.0.0
diff --git a/README.md b/README.md
@@ -65,11 +65,20 @@ newer equivalents).
 
 ### Building from Source
 
-If you prefer, you may build from source. This requires a modern C++ toolchain.
-On macOS you can use the system compiler. On linux, install the required
-toolchain using:
+If you prefer, you may build from source. This requires a modern C++ toolchain
+and bazel.
+
+On macOS you can use the system compiler and install
+[bazelisk](https://github.com/bazelbuild/bazelisk) using
+[homebrew](https://docs.brew.sh/Installation):
+
+    $ brew install bazelisk
+
+On linux, install the required toolchain using:
 
     $ sudo apt install clang libtinfo5 patchelf
+    $ wget https://github.com/bazelbuild/bazelisk/releases/download/v1.7.5/bazelisk-linux-amd64 -O bazel && chmod +x bazel
+    $ sudo mv bazel /usr/local/bin
     $ export CC=clang
     $ export CXX=clang++