fix: use credential keyword for credential references (#138)

Signed-off-by: Grant Linville <[email protected]>

ingest.gpt

@@ -1,5 +1,5 @@
 Name: Knowledge Ingestion
 Description: Ingest content into a dataset.
-Tools: github.com/gptscript-ai/credentials/model-provider
+Credential: github.com/gptscript-ai/credentials/model-provider
 
 #!${GPTSCRIPT_TOOL_DIR}/bin/gptscript-go-tool ingest --prune --dataset ${GPTSCRIPT_DATASET} "${GPTSCRIPT_INPUT}"

tool.gpt

@@ -16,7 +16,7 @@ If the answers that the knowledge tool returns seem irrelevant, you may use anot
 ---
 Name: Knowledge Retrieval
 Description: Retrieve information from files uploaded by the user.
-Tools: github.com/gptscript-ai/credentials/model-provider
+Credential: github.com/gptscript-ai/credentials/model-provider
 Param: query: The query to search for in the knowledge base. It will be used for semantic similarity search, so enhance it accordingly to yield good results.
 Param: debug: (OPTIONAL) Set to "true" to enable debug mode - only use if you are explicitly asked to do so.
 
@@ -25,7 +25,7 @@ Param: debug: (OPTIONAL) Set to "true" to enable debug mode - only use if you ar
 ---
 Name: Knowledge Retrieval Context
 Description: Add knowledge retrieved from uploaded files to the context.
-Tools: github.com/gptscript-ai/credentials/model-provider
+Credential: github.com/gptscript-ai/credentials/model-provider
 Type: context
 Input Filter: QueryRelevancy
 Output Filter: KnowledgeInstructions
@@ -185,4 +185,4 @@ Params: input: Path to input file
 Params: output: Path to output file where the extracted markdown content should be written to. Should end with .md
 Params: loader: Optionally choose a specific loader for the file to not rely on the default. Only use if explicitly specified.
 
-#!${GPTSCRIPT_TOOL_DIR}/bin/gptscript-go-tool load ${INPUT} ${OUTPUT} ${LOADER:+--loader=${LOADER}}
+#!${GPTSCRIPT_TOOL_DIR}/bin/gptscript-go-tool load ${INPUT} ${OUTPUT} ${LOADER:+--loader=${LOADER}}