chore(release): 1.7.0 [skip ci]

CHANGELOG.md

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+# [1.7.0](https://github.com/gravitee-io/gravitee-policy-assign-content/compare/1.6.0...1.7.0) (2022-01-21)
+
+
+### Bug Fixes
+
+* **assign-content:** Do not allow template injection ([bc6595d](https://github.com/gravitee-io/gravitee-policy-assign-content/commit/bc6595d8d1249b1e68d26052167ed5adeaace309)), closes [gravitee-io/issues#5033](https://github.com/gravitee-io/issues/issues/5033)
+* upgrade org.freemarker:freemarker from 2.3.30 to 2.3.31 ([75f1c72](https://github.com/gravitee-io/gravitee-policy-assign-content/commit/75f1c72a2c62848898d2938fe37d3efbca6e660d))
+
+
+### Features
+
+* **headers:** Internal rework and introduce HTTP Headers API ([a63b6f6](https://github.com/gravitee-io/gravitee-policy-assign-content/commit/a63b6f6e2d5466467c16389d9b190365fb5f7df0)), closes [gravitee-io/issues#6772](https://github.com/gravitee-io/issues/issues/6772)
+* **perf:** adapt policy for new classloader system ([56aa796](https://github.com/gravitee-io/gravitee-policy-assign-content/commit/56aa796d1a47cf2601db5ecf4b709576a9ca5bab)), closes [gravitee-io/issues#6758](https://github.com/gravitee-io/issues/issues/6758)