fix: Logo needs to be referenced by full url (oscal-compass#28)

Signed-off-by: Takumi Yanagawa <[email protected]>

README.md

@@ -1,4 +1,4 @@
-# <img alt="Logo" width="50px" src="./assets/compliance-to-policy-800x800.PNG" style="vertical-align: middle;" /> Compliance-to-Policy (also known as `C2P`)
+# <img alt="Logo" width="50px" src="https://raw.githubusercontent.com/oscal-compass/compliance-to-policy/main/assets/compliance-to-policy-800x800.PNG" style="vertical-align: middle;" /> Compliance-to-Policy (also known as `C2P`)
 
 Compliance-to-Policy (C2P) is designed to bridge Compliance as Code such as Open Security Controls Assessment Language (OSCAL) and Policy as Code used by Policy Validation Point (PVP). It generates policies in native format of PVP from OSCAL Component Definitions and produces OSCAL Assessment Results from the native assessment results of PVP. C2P can be used both as a command-line tool and a Python library, making it easy and flexible to integrate into your Continuous Compliance pipelines, such as GitHub Actions, Tekton Pipelines, or Agile Authoring Pipelines. It supports multiple PVP engines, including [Kyverno](https://kyverno.io/), [Open Cluster Management Policy Framework](https://open-cluster-management.io/), and the open-source [Auditree](https://auditree.github.io/), through dedicated plugins for each. Custom plugins can be implemented with a small amount of Python code.