better readme installation guide formatting
@@ -52,7 +52,7 @@ sensuapp/sensu-go:2.0.0-alpha sensu-agent start \
3. Download and install the Sensu 2.0 CLI tool
-On macOS
+ **On macOS**
```
$ latest=$(curl -s https://storage.googleapis.com/sensu-binaries/latest.txt)
@@ -64,7 +64,7 @@ $ chmod +x sensuctl
$ sudo mv sensuctl /usr/local/bin/
```
-On Debian/Ubuntu Linux
+ **On Debian/Ubuntu Linux**
```
$ curl -s \
@@ -74,7 +74,7 @@ https://packagecloud.io/install/repositories/sensu/nightly/script.deb.sh \
$ sudo apt-get install sensu-cli
```
-On RHEL/CentOS Linux
+ **On RHEL/CentOS Linux**
```
$ curl -s \
