docs: Improve README.md style (#154)

README.md

@@ -1,7 +1,7 @@
-[![CircleCI](https://circleci.com/gh/DataDog/dd-opentracing-cpp/tree/master.svg?style=svg)](https://circleci.com/gh/DataDog/dd-opentracing-cpp/tree/master)
-
 # Datadog OpenTracing C++ Client
 
+[![CircleCI](https://circleci.com/gh/DataDog/dd-opentracing-cpp/tree/master.svg?style=svg)](https://app.circleci.com/pipelines/github/DataDog/dd-opentracing-cpp?branch=master)
+
 ## Usage
 
 Usage docs are on the main Datadog website:
@@ -22,55 +22,58 @@ Before considering contributions to the project, please take a moment to read ou
 ### Dependencies
 
 Building this project requires the following tools installed:
-- Build tools (eg. `build-essential`, xcode)
+
+- Build tools (e.g. `build-essential`, xcode)
 - `cmake` >= 3.1
 
 Additional libraries are installed via a script.
 
 ### Build Steps
 
 - Clone the repository
-```
-git clone https://github.com/DataDog/dd-opentracing-cpp
-```
+    ```sh
+    git clone https://github.com/DataDog/dd-opentracing-cpp
+    ```
 - Install additional library dependencies (requires `sudo`)
-```
-cd dd-opentracing-cpp
-sudo scripts/install_dependencies.sh
-```
-- Generate build files using cmake
-```
-mkdir .build
-cd .build
-cmake ..
-```
+    ```sh
+    cd dd-opentracing-cpp
+    sudo scripts/install_dependencies.sh
+    ```
+- Generate build files using `cmake`
+    ```sh
+    mkdir .build
+    cd .build
+    cmake ..
+    ```
 - Run the build
-```
-make
-```
+    ```sh
+    make
+    ```
 - (Optional) Run the tests
-```
-cmake -DBUILD_TESTING=ON ..
-make
-ctest --output-on-failure
-```
-- (Optional) Install in `/usr/local`
-```
-make install
-```
+    ```sh
+    cmake -DBUILD_TESTING=ON ..
+    make
+    ctest --output-on-failure
+    ```
+- (Optional) Install to `/usr/local`
+    ```sh
+    make install
+    ```
 
 If you want [sanitizers](https://github.com/google/sanitizers) to be enabled, then add either the `-DSANITIZE_THREAD=ON -DSANITIZE_UNDEFINED=ON` or `-DSANITIZE_ADDRESS=ON` flags to cmake, running the tests will now also check with the sanitizers.
 
 ### Integration tests
 
 Integration tests require additional tools installed:
+
 - [msgpack-cli](https://github.com/jakm/msgpack-cli)
 - [wiremock](https://github.com/tomakehurst/wiremock)
 - `jq`
 
 Installation details can be extracted from the [Dockerfile](https://github.com/DataDog/docker-library/blob/master/dd-opentracing-cpp/test/0.3.1/Dockerfile#L7-L14) for the container that is usually used when running integration tests.
 
-The script below will run the integration tests directly.
-```
+Run this command to run the integration tests directly.
+
+```sh
 test/integration/run_integration_tests_local.sh
 ```