Adding release notes for 170.0.48-preview (#557)

Author: llali

release-notes/Microsoft.SqlPackage/170/170.0.48-preview.md

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+# Release Notes
+
+## Microsoft.SqlPackage 170.0.48-preview
+
+This update brings the below changes over the previous release:
+
+### Breaking Change
+* Removed support for .NET Framework 4.6.
+
+### Added
+
+### Fixed
+
+### Changed
+* Added support for .NET Framework 4.7
+* Updated Microsoft.SqlServer.TransactSql.ScriptDom to 170.18.0

release-notes/Microsoft.SqlServer.DacFx/170/170.0.48-preview.md

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+# Release Notes
+
+## Microsoft.SqlServer.DacFx 170.0.48-preview
+
+This update brings the below changes over the previous release:
+
+### Breaking Change
+* Removed support for .NET Framework 4.6.
+
+### Added
+
+### Fixed
+
+### Changed
+* Added support for .NET Framework 4.7
+* Updated Microsoft.SqlServer.TransactSql.ScriptDom to 170.18.0